projects / GitHub / mt8127 / android_kernel_alcatel_ttab.git / blame
? search:
summary | shortlog | log | commit | commitdiff | tree
blob | blame (incremental) | history | HEAD
Bluetooth: Read RFC conf option on a successful Conf RSP
[GitHub/mt8127/android_kernel_alcatel_ttab.git] / net / bluetooth / l2cap.c
CommitLineData
8e87d142 1/*
1da177e4
LT		 2 BlueZ - Bluetooth protocol stack for Linux
3 Copyright (C) 2000-2001 Qualcomm Incorporated
4
5 Written 2000,2001 by Maxim Krasnyansky <maxk@qualcomm.com>
6
7 This program is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License version 2 as
9 published by the Free Software Foundation;
10
11 THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
12 OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
13 FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT OF THIRD PARTY RIGHTS.
14 IN NO EVENT SHALL THE COPYRIGHT HOLDER(S) AND AUTHOR(S) BE LIABLE FOR ANY
8e87d142
YH		 15 CLAIM, OR ANY SPECIAL INDIRECT OR CONSEQUENTIAL DAMAGES, OR ANY DAMAGES
16 WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
17 ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
1da177e4
LT		 18 OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
19
8e87d142
YH		 20 ALL LIABILITY, INCLUDING LIABILITY FOR INFRINGEMENT OF ANY PATENTS,
21 COPYRIGHTS, TRADEMARKS OR OTHER RIGHTS, RELATING TO USE OF THIS
1da177e4
LT		 22 SOFTWARE IS DISCLAIMED.
23*/
24
25/* Bluetooth L2CAP core and sockets. */
26
1da177e4
LT		 27#include <linux/module.h>
28
29#include <linux/types.h>
4fc268d2 30#include <linux/capability.h>
1da177e4
LT		 31#include <linux/errno.h>
32#include <linux/kernel.h>
1da177e4
LT		 33#include <linux/sched.h>
34#include <linux/slab.h>
35#include <linux/poll.h>
36#include <linux/fcntl.h>
37#include <linux/init.h>
38#include <linux/interrupt.h>
39#include <linux/socket.h>
40#include <linux/skbuff.h>
1da177e4 41#include <linux/list.h>
be9d1227 42#include <linux/device.h>
aef7d97c
MH		 43#include <linux/debugfs.h>
44#include <linux/seq_file.h>
af05b30b 45#include <linux/uaccess.h>
fcc203c3 46#include <linux/crc16.h>
1da177e4
LT		 47#include <net/sock.h>
48
49#include <asm/system.h>
1da177e4
LT		 50#include <asm/unaligned.h>
51
52#include <net/bluetooth/bluetooth.h>
53#include <net/bluetooth/hci_core.h>
54#include <net/bluetooth/l2cap.h>
55
44dd46de
MH		 56#define VERSION "2.14"
57
58static int enable_ertm = 0;
5fbcd3d1 59static int max_transmit = L2CAP_DEFAULT_MAX_TX;
f0709e03 60
47ec1dcd 61static u32 l2cap_feat_mask = L2CAP_FEAT_FIXED_CHAN;
e1027a7c 62static u8 l2cap_fixed_chan[8] = { 0x02, };
1da177e4 63
90ddc4f0 64static const struct proto_ops l2cap_sock_ops;
1da177e4
LT		 65
66static struct bt_sock_list l2cap_sk_list = {
d5fb2962 67 .lock = __RW_LOCK_UNLOCKED(l2cap_sk_list.lock)
1da177e4
LT		 68};
69
1da177e4
LT		 70static void __l2cap_sock_close(struct sock *sk, int reason);
71static void l2cap_sock_close(struct sock *sk);
72static void l2cap_sock_kill(struct sock *sk);
73
74static struct sk_buff *l2cap_build_cmd(struct l2cap_conn *conn,
75 u8 code, u8 ident, u16 dlen, void *data);
76
77/* ---- L2CAP timers ---- */
78static void l2cap_sock_timeout(unsigned long arg)
79{
80 struct sock *sk = (struct sock *) arg;
b1235d79 81 int reason;
1da177e4
LT		 82
83 BT_DBG("sock %p state %d", sk, sk->sk_state);
84
85 bh_lock_sock(sk);
b1235d79 86
f62e4323
MH		 87 if (sk->sk_state == BT_CONNECTED || sk->sk_state == BT_CONFIG)
88 reason = ECONNREFUSED;
89 else if (sk->sk_state == BT_CONNECT &&
2af6b9d5 90 l2cap_pi(sk)->sec_level != BT_SECURITY_SDP)
b1235d79
MH		 91 reason = ECONNREFUSED;
92 else
93 reason = ETIMEDOUT;
94
95 __l2cap_sock_close(sk, reason);
96
1da177e4
LT		 97 bh_unlock_sock(sk);
98
99 l2cap_sock_kill(sk);
100 sock_put(sk);
101}
102
103static void l2cap_sock_set_timer(struct sock *sk, long timeout)
104{
105 BT_DBG("sk %p state %d timeout %ld", sk, sk->sk_state, timeout);
106 sk_reset_timer(sk, &sk->sk_timer, jiffies + timeout);
107}
108
109static void l2cap_sock_clear_timer(struct sock *sk)
110{
111 BT_DBG("sock %p state %d", sk, sk->sk_state);
112 sk_stop_timer(sk, &sk->sk_timer);
113}
114
0139418c
MH		 115/* ---- L2CAP channels ---- */
116static struct sock *__l2cap_get_chan_by_dcid(struct l2cap_chan_list *l, u16 cid)
117{
118 struct sock *s;
119 for (s = l->head; s; s = l2cap_pi(s)->next_c) {
120 if (l2cap_pi(s)->dcid == cid)
121 break;
122 }
123 return s;
124}
125
126static struct sock *__l2cap_get_chan_by_scid(struct l2cap_chan_list *l, u16 cid)
127{
128 struct sock *s;
129 for (s = l->head; s; s = l2cap_pi(s)->next_c) {
130 if (l2cap_pi(s)->scid == cid)
131 break;
132 }
133 return s;
134}
135
136/* Find channel with given SCID.
137 * Returns locked socket */
138static inline struct sock *l2cap_get_chan_by_scid(struct l2cap_chan_list *l, u16 cid)
139{
140 struct sock *s;
141 read_lock(&l->lock);
142 s = __l2cap_get_chan_by_scid(l, cid);
af05b30b
GP		 143 if (s)
144 bh_lock_sock(s);
0139418c
MH		 145 read_unlock(&l->lock);
146 return s;
147}
148
149static struct sock *__l2cap_get_chan_by_ident(struct l2cap_chan_list *l, u8 ident)
150{
151 struct sock *s;
152 for (s = l->head; s; s = l2cap_pi(s)->next_c) {
153 if (l2cap_pi(s)->ident == ident)
154 break;
155 }
156 return s;
157}
158
159static inline struct sock *l2cap_get_chan_by_ident(struct l2cap_chan_list *l, u8 ident)
160{
161 struct sock *s;
162 read_lock(&l->lock);
163 s = __l2cap_get_chan_by_ident(l, ident);
af05b30b
GP		 164 if (s)
165 bh_lock_sock(s);
0139418c
MH		 166 read_unlock(&l->lock);
167 return s;
168}
169
170static u16 l2cap_alloc_cid(struct l2cap_chan_list *l)
171{
8db4dc46 172 u16 cid = L2CAP_CID_DYN_START;
0139418c 173
8db4dc46 174 for (; cid < L2CAP_CID_DYN_END; cid++) {
af05b30b 175 if (!__l2cap_get_chan_by_scid(l, cid))
0139418c
MH		 176 return cid;
177 }
178
179 return 0;
180}
181
182static inline void __l2cap_chan_link(struct l2cap_chan_list *l, struct sock *sk)
183{
184 sock_hold(sk);
185
186 if (l->head)
187 l2cap_pi(l->head)->prev_c = sk;
188
189 l2cap_pi(sk)->next_c = l->head;
190 l2cap_pi(sk)->prev_c = NULL;
191 l->head = sk;
192}
193
194static inline void l2cap_chan_unlink(struct l2cap_chan_list *l, struct sock *sk)
195{
196 struct sock *next = l2cap_pi(sk)->next_c, *prev = l2cap_pi(sk)->prev_c;
197
fd1278d7 198 write_lock_bh(&l->lock);
0139418c
MH		 199 if (sk == l->head)
200 l->head = next;
201
202 if (next)
203 l2cap_pi(next)->prev_c = prev;
204 if (prev)
205 l2cap_pi(prev)->next_c = next;
fd1278d7 206 write_unlock_bh(&l->lock);
0139418c
MH		 207
208 __sock_put(sk);
209}
210
211static void __l2cap_chan_add(struct l2cap_conn *conn, struct sock *sk, struct sock *parent)
212{
213 struct l2cap_chan_list *l = &conn->chan_list;
214
af05b30b
GP		 215 BT_DBG("conn %p, psm 0x%2.2x, dcid 0x%4.4x", conn,
216 l2cap_pi(sk)->psm, l2cap_pi(sk)->dcid);
0139418c 217
2950f21a
MH		 218 conn->disc_reason = 0x13;
219
0139418c
MH		 220 l2cap_pi(sk)->conn = conn;
221
222 if (sk->sk_type == SOCK_SEQPACKET) {
223 /* Alloc CID for connection-oriented socket */
224 l2cap_pi(sk)->scid = l2cap_alloc_cid(l);
225 } else if (sk->sk_type == SOCK_DGRAM) {
226 /* Connectionless socket */
8db4dc46
GP		 227 l2cap_pi(sk)->scid = L2CAP_CID_CONN_LESS;
228 l2cap_pi(sk)->dcid = L2CAP_CID_CONN_LESS;
0139418c
MH		 229 l2cap_pi(sk)->omtu = L2CAP_DEFAULT_MTU;
230 } else {
231 /* Raw socket can send/recv signalling messages only */
8db4dc46
GP		 232 l2cap_pi(sk)->scid = L2CAP_CID_SIGNALING;
233 l2cap_pi(sk)->dcid = L2CAP_CID_SIGNALING;
0139418c
MH		 234 l2cap_pi(sk)->omtu = L2CAP_DEFAULT_MTU;
235 }
236
237 __l2cap_chan_link(l, sk);
238
239 if (parent)
240 bt_accept_enqueue(parent, sk);
241}
242
8e87d142 243/* Delete channel.
0139418c
MH		 244 * Must be called on the locked socket. */
245static void l2cap_chan_del(struct sock *sk, int err)
246{
247 struct l2cap_conn *conn = l2cap_pi(sk)->conn;
248 struct sock *parent = bt_sk(sk)->parent;
249
250 l2cap_sock_clear_timer(sk);
251
252 BT_DBG("sk %p, conn %p, err %d", sk, conn, err);
253
8e87d142 254 if (conn) {
0139418c
MH		 255 /* Unlink from channel list */
256 l2cap_chan_unlink(&conn->chan_list, sk);
257 l2cap_pi(sk)->conn = NULL;
258 hci_conn_put(conn->hcon);
259 }
260
b1235d79 261 sk->sk_state = BT_CLOSED;
0139418c
MH		 262 sock_set_flag(sk, SOCK_ZAPPED);
263
264 if (err)
265 sk->sk_err = err;
266
267 if (parent) {
268 bt_accept_unlink(sk);
269 parent->sk_data_ready(parent, 0);
270 } else
271 sk->sk_state_change(sk);
272}
273
79d554a6 274/* Service level security */
2af6b9d5 275static inline int l2cap_check_security(struct sock *sk)
79d554a6
MH		 276{
277 struct l2cap_conn *conn = l2cap_pi(sk)->conn;
0684e5f9
MH		 278 __u8 auth_type;
279
00ae4af9
MH		 280 if (l2cap_pi(sk)->psm == cpu_to_le16(0x0001)) {
281 if (l2cap_pi(sk)->sec_level == BT_SECURITY_HIGH)
282 auth_type = HCI_AT_NO_BONDING_MITM;
283 else
af05b30b 284 auth_type = HCI_AT_NO_BONDING;
00ae4af9
MH		 285
286 if (l2cap_pi(sk)->sec_level == BT_SECURITY_LOW)
287 l2cap_pi(sk)->sec_level = BT_SECURITY_SDP;
288 } else {
289 switch (l2cap_pi(sk)->sec_level) {
290 case BT_SECURITY_HIGH:
291 auth_type = HCI_AT_GENERAL_BONDING_MITM;
292 break;
293 case BT_SECURITY_MEDIUM:
294 auth_type = HCI_AT_GENERAL_BONDING;
295 break;
296 default:
297 auth_type = HCI_AT_NO_BONDING;
298 break;
299 }
0684e5f9 300 }
79d554a6 301
0684e5f9
MH		 302 return hci_conn_security(conn->hcon, l2cap_pi(sk)->sec_level,
303 auth_type);
79d554a6
MH		 304}
305
4e8402a3
MH		 306static inline u8 l2cap_get_ident(struct l2cap_conn *conn)
307{
308 u8 id;
309
310 /* Get next available identificator.
311 * 1 - 128 are used by kernel.
312 * 129 - 199 are reserved.
313 * 200 - 254 are used by utilities like l2ping, etc.
314 */
315
316 spin_lock_bh(&conn->lock);
317
318 if (++conn->tx_ident > 128)
319 conn->tx_ident = 1;
320
321 id = conn->tx_ident;
322
323 spin_unlock_bh(&conn->lock);
324
325 return id;
326}
327
328static inline int l2cap_send_cmd(struct l2cap_conn *conn, u8 ident, u8 code, u16 len, void *data)
329{
330 struct sk_buff *skb = l2cap_build_cmd(conn, code, ident, len, data);
331
332 BT_DBG("code 0x%2.2x", code);
333
334 if (!skb)
335 return -ENOMEM;
336
337 return hci_send_acl(conn->hcon, skb, 0);
338}
339
1c2acffb
GP		 340static inline int l2cap_send_sframe(struct l2cap_pinfo *pi, u16 control)
341{
342 struct sk_buff *skb;
343 struct l2cap_hdr *lh;
344 struct l2cap_conn *conn = pi->conn;
fcc203c3
GP		 345 int count, hlen = L2CAP_HDR_SIZE + 2;
346
347 if (pi->fcs == L2CAP_FCS_CRC16)
348 hlen += 2;
1c2acffb
GP		 349
350 BT_DBG("pi %p, control 0x%2.2x", pi, control);
351
fcc203c3 352 count = min_t(unsigned int, conn->mtu, hlen);
1c2acffb
GP		 353 control |= L2CAP_CTRL_FRAME_TYPE;
354
9e917af1
GP		 355 if (pi->conn_state & L2CAP_CONN_SEND_FBIT) {
356 control |= L2CAP_CTRL_FINAL;
357 pi->conn_state &= ~L2CAP_CONN_SEND_FBIT;
358 }
359
f0946ccf
GP		 360 if (pi->conn_state & L2CAP_CONN_SEND_PBIT) {
361 control |= L2CAP_CTRL_POLL;
362 pi->conn_state &= ~L2CAP_CONN_SEND_PBIT;
363 }
364
1c2acffb
GP		 365 skb = bt_skb_alloc(count, GFP_ATOMIC);
366 if (!skb)
367 return -ENOMEM;
368
369 lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE);
fcc203c3 370 lh->len = cpu_to_le16(hlen - L2CAP_HDR_SIZE);
1c2acffb
GP		 371 lh->cid = cpu_to_le16(pi->dcid);
372 put_unaligned_le16(control, skb_put(skb, 2));
373
fcc203c3
GP		 374 if (pi->fcs == L2CAP_FCS_CRC16) {
375 u16 fcs = crc16(0, (u8 *)lh, count - 2);
376 put_unaligned_le16(fcs, skb_put(skb, 2));
377 }
378
1c2acffb
GP		 379 return hci_send_acl(pi->conn->hcon, skb, 0);
380}
381
7e743090
GP		 382static inline int l2cap_send_rr_or_rnr(struct l2cap_pinfo *pi, u16 control)
383{
384 if (pi->conn_state & L2CAP_CONN_LOCAL_BUSY)
385 control |= L2CAP_SUPER_RCV_NOT_READY;
386 else
387 control |= L2CAP_SUPER_RCV_READY;
388
2ab25cdd
GP		 389 control |= pi->buffer_seq << L2CAP_CTRL_REQSEQ_SHIFT;
390
7e743090
GP		 391 return l2cap_send_sframe(pi, control);
392}
393
79d554a6
MH		 394static void l2cap_do_start(struct sock *sk)
395{
396 struct l2cap_conn *conn = l2cap_pi(sk)->conn;
397
398 if (conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_SENT) {
984947dc
MH		 399 if (!(conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_DONE))
400 return;
401
2af6b9d5 402 if (l2cap_check_security(sk)) {
b1235d79
MH		 403 struct l2cap_conn_req req;
404 req.scid = cpu_to_le16(l2cap_pi(sk)->scid);
405 req.psm = l2cap_pi(sk)->psm;
79d554a6 406
b1235d79 407 l2cap_pi(sk)->ident = l2cap_get_ident(conn);
79d554a6 408
b1235d79 409 l2cap_send_cmd(conn, l2cap_pi(sk)->ident,
79d554a6 410 L2CAP_CONN_REQ, sizeof(req), &req);
b1235d79 411 }
79d554a6
MH		 412 } else {
413 struct l2cap_info_req req;
414 req.type = cpu_to_le16(L2CAP_IT_FEAT_MASK);
415
416 conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_SENT;
417 conn->info_ident = l2cap_get_ident(conn);
418
419 mod_timer(&conn->info_timer, jiffies +
420 msecs_to_jiffies(L2CAP_INFO_TIMEOUT));
421
422 l2cap_send_cmd(conn, conn->info_ident,
423 L2CAP_INFO_REQ, sizeof(req), &req);
424 }
425}
426
22121fc9
GP		 427static void l2cap_send_disconn_req(struct l2cap_conn *conn, struct sock *sk)
428{
429 struct l2cap_disconn_req req;
430
431 req.dcid = cpu_to_le16(l2cap_pi(sk)->dcid);
432 req.scid = cpu_to_le16(l2cap_pi(sk)->scid);
433 l2cap_send_cmd(conn, l2cap_get_ident(conn),
434 L2CAP_DISCONN_REQ, sizeof(req), &req);
435}
436
1da177e4 437/* ---- L2CAP connections ---- */
4e8402a3
MH		 438static void l2cap_conn_start(struct l2cap_conn *conn)
439{
440 struct l2cap_chan_list *l = &conn->chan_list;
441 struct sock *sk;
442
443 BT_DBG("conn %p", conn);
444
445 read_lock(&l->lock);
446
447 for (sk = l->head; sk; sk = l2cap_pi(sk)->next_c) {
448 bh_lock_sock(sk);
449
450 if (sk->sk_type != SOCK_SEQPACKET) {
79d554a6
MH		 451 bh_unlock_sock(sk);
452 continue;
453 }
454
455 if (sk->sk_state == BT_CONNECT) {
2af6b9d5 456 if (l2cap_check_security(sk)) {
b1235d79
MH		 457 struct l2cap_conn_req req;
458 req.scid = cpu_to_le16(l2cap_pi(sk)->scid);
459 req.psm = l2cap_pi(sk)->psm;
79d554a6 460
b1235d79 461 l2cap_pi(sk)->ident = l2cap_get_ident(conn);
79d554a6 462
b1235d79 463 l2cap_send_cmd(conn, l2cap_pi(sk)->ident,
4e8402a3 464 L2CAP_CONN_REQ, sizeof(req), &req);
b1235d79 465 }
79d554a6
MH		 466 } else if (sk->sk_state == BT_CONNECT2) {
467 struct l2cap_conn_rsp rsp;
468 rsp.scid = cpu_to_le16(l2cap_pi(sk)->dcid);
469 rsp.dcid = cpu_to_le16(l2cap_pi(sk)->scid);
470
2af6b9d5 471 if (l2cap_check_security(sk)) {
f66dc81f
MH		 472 if (bt_sk(sk)->defer_setup) {
473 struct sock *parent = bt_sk(sk)->parent;
474 rsp.result = cpu_to_le16(L2CAP_CR_PEND);
475 rsp.status = cpu_to_le16(L2CAP_CS_AUTHOR_PEND);
476 parent->sk_data_ready(parent, 0);
477
478 } else {
479 sk->sk_state = BT_CONFIG;
480 rsp.result = cpu_to_le16(L2CAP_CR_SUCCESS);
481 rsp.status = cpu_to_le16(L2CAP_CS_NO_INFO);
482 }
79d554a6
MH		 483 } else {
484 rsp.result = cpu_to_le16(L2CAP_CR_PEND);
485 rsp.status = cpu_to_le16(L2CAP_CS_AUTHEN_PEND);
486 }
487
488 l2cap_send_cmd(conn, l2cap_pi(sk)->ident,
489 L2CAP_CONN_RSP, sizeof(rsp), &rsp);
4e8402a3
MH		 490 }
491
492 bh_unlock_sock(sk);
493 }
494
495 read_unlock(&l->lock);
496}
497
498static void l2cap_conn_ready(struct l2cap_conn *conn)
499{
79d554a6
MH		 500 struct l2cap_chan_list *l = &conn->chan_list;
501 struct sock *sk;
4e8402a3 502
79d554a6 503 BT_DBG("conn %p", conn);
4e8402a3 504
79d554a6 505 read_lock(&l->lock);
4e8402a3 506
79d554a6
MH		 507 for (sk = l->head; sk; sk = l2cap_pi(sk)->next_c) {
508 bh_lock_sock(sk);
4e8402a3 509
79d554a6
MH		 510 if (sk->sk_type != SOCK_SEQPACKET) {
511 l2cap_sock_clear_timer(sk);
512 sk->sk_state = BT_CONNECTED;
513 sk->sk_state_change(sk);
514 } else if (sk->sk_state == BT_CONNECT)
515 l2cap_do_start(sk);
4e8402a3 516
79d554a6 517 bh_unlock_sock(sk);
4e8402a3 518 }
79d554a6
MH		 519
520 read_unlock(&l->lock);
4e8402a3
MH		 521}
522
523/* Notify sockets that we cannot guaranty reliability anymore */
524static void l2cap_conn_unreliable(struct l2cap_conn *conn, int err)
525{
526 struct l2cap_chan_list *l = &conn->chan_list;
527 struct sock *sk;
528
529 BT_DBG("conn %p", conn);
530
531 read_lock(&l->lock);
532
533 for (sk = l->head; sk; sk = l2cap_pi(sk)->next_c) {
2af6b9d5 534 if (l2cap_pi(sk)->force_reliable)
4e8402a3
MH		 535 sk->sk_err = err;
536 }
537
538 read_unlock(&l->lock);
539}
540
541static void l2cap_info_timeout(unsigned long arg)
542{
543 struct l2cap_conn *conn = (void *) arg;
544
984947dc 545 conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE;
e1027a7c 546 conn->info_ident = 0;
984947dc 547
4e8402a3
MH		 548 l2cap_conn_start(conn);
549}
550
1da177e4
LT		 551static struct l2cap_conn *l2cap_conn_add(struct hci_conn *hcon, u8 status)
552{
0139418c 553 struct l2cap_conn *conn = hcon->l2cap_data;
1da177e4 554
0139418c 555 if (conn || status)
1da177e4
LT		 556 return conn;
557
0139418c
MH		 558 conn = kzalloc(sizeof(struct l2cap_conn), GFP_ATOMIC);
559 if (!conn)
1da177e4 560 return NULL;
1da177e4
LT		 561
562 hcon->l2cap_data = conn;
563 conn->hcon = hcon;
564
0139418c
MH		 565 BT_DBG("hcon %p conn %p", hcon, conn);
566
1da177e4
LT		 567 conn->mtu = hcon->hdev->acl_mtu;
568 conn->src = &hcon->hdev->bdaddr;
569 conn->dst = &hcon->dst;
570
4e8402a3
MH		 571 conn->feat_mask = 0;
572
1da177e4
LT		 573 spin_lock_init(&conn->lock);
574 rwlock_init(&conn->chan_list.lock);
575
45054dc1
DY		 576 setup_timer(&conn->info_timer, l2cap_info_timeout,
577 (unsigned long) conn);
578
2950f21a
MH		 579 conn->disc_reason = 0x13;
580
1da177e4
LT		 581 return conn;
582}
583
0139418c 584static void l2cap_conn_del(struct hci_conn *hcon, int err)
1da177e4 585{
0139418c 586 struct l2cap_conn *conn = hcon->l2cap_data;
1da177e4
LT		 587 struct sock *sk;
588
0139418c
MH		 589 if (!conn)
590 return;
1da177e4
LT		 591
592 BT_DBG("hcon %p conn %p, err %d", hcon, conn, err);
593
7585b97a 594 kfree_skb(conn->rx_skb);
1da177e4
LT		 595
596 /* Kill channels */
597 while ((sk = conn->chan_list.head)) {
598 bh_lock_sock(sk);
599 l2cap_chan_del(sk, err);
600 bh_unlock_sock(sk);
601 l2cap_sock_kill(sk);
602 }
603
8e8440f5
DY		 604 if (conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_SENT)
605 del_timer_sync(&conn->info_timer);
3ab22731 606
1da177e4
LT		 607 hcon->l2cap_data = NULL;
608 kfree(conn);
1da177e4
LT		 609}
610
611static inline void l2cap_chan_add(struct l2cap_conn *conn, struct sock *sk, struct sock *parent)
612{
613 struct l2cap_chan_list *l = &conn->chan_list;
fd1278d7 614 write_lock_bh(&l->lock);
1da177e4 615 __l2cap_chan_add(conn, sk, parent);
fd1278d7 616 write_unlock_bh(&l->lock);
1da177e4
LT		 617}
618
1da177e4 619/* ---- Socket interface ---- */
8e036fc3 620static struct sock *__l2cap_get_sock_by_addr(__le16 psm, bdaddr_t *src)
1da177e4
LT		 621{
622 struct sock *sk;
623 struct hlist_node *node;
624 sk_for_each(sk, node, &l2cap_sk_list.head)
625 if (l2cap_pi(sk)->sport == psm && !bacmp(&bt_sk(sk)->src, src))
626 goto found;
627 sk = NULL;
628found:
629 return sk;
630}
631
632/* Find socket with psm and source bdaddr.
633 * Returns closest match.
634 */
8e036fc3 635static struct sock *__l2cap_get_sock_by_psm(int state, __le16 psm, bdaddr_t *src)
1da177e4
LT		 636{
637 struct sock *sk = NULL, *sk1 = NULL;
638 struct hlist_node *node;
639
640 sk_for_each(sk, node, &l2cap_sk_list.head) {
641 if (state && sk->sk_state != state)
642 continue;
643
644 if (l2cap_pi(sk)->psm == psm) {
645 /* Exact match. */
646 if (!bacmp(&bt_sk(sk)->src, src))
647 break;
648
649 /* Closest match */
650 if (!bacmp(&bt_sk(sk)->src, BDADDR_ANY))
651 sk1 = sk;
652 }
653 }
654 return node ? sk : sk1;
655}
656
657/* Find socket with given address (psm, src).
658 * Returns locked socket */
8e036fc3 659static inline struct sock *l2cap_get_sock_by_psm(int state, __le16 psm, bdaddr_t *src)
1da177e4
LT		 660{
661 struct sock *s;
662 read_lock(&l2cap_sk_list.lock);
663 s = __l2cap_get_sock_by_psm(state, psm, src);
af05b30b
GP		 664 if (s)
665 bh_lock_sock(s);
1da177e4
LT		 666 read_unlock(&l2cap_sk_list.lock);
667 return s;
668}
669
670static void l2cap_sock_destruct(struct sock *sk)
671{
672 BT_DBG("sk %p", sk);
673
674 skb_queue_purge(&sk->sk_receive_queue);
675 skb_queue_purge(&sk->sk_write_queue);
676}
677
678static void l2cap_sock_cleanup_listen(struct sock *parent)
679{
680 struct sock *sk;
681
682 BT_DBG("parent %p", parent);
683
684 /* Close not yet accepted channels */
685 while ((sk = bt_accept_dequeue(parent, NULL)))
686 l2cap_sock_close(sk);
687
b1235d79 688 parent->sk_state = BT_CLOSED;
1da177e4
LT		 689 sock_set_flag(parent, SOCK_ZAPPED);
690}
691
692/* Kill socket (only if zapped and orphan)
693 * Must be called on unlocked socket.
694 */
695static void l2cap_sock_kill(struct sock *sk)
696{
697 if (!sock_flag(sk, SOCK_ZAPPED) || sk->sk_socket)
698 return;
699
700 BT_DBG("sk %p state %d", sk, sk->sk_state);
701
702 /* Kill poor orphan */
703 bt_sock_unlink(&l2cap_sk_list, sk);
704 sock_set_flag(sk, SOCK_DEAD);
705 sock_put(sk);
706}
707
708static void __l2cap_sock_close(struct sock *sk, int reason)
709{
710 BT_DBG("sk %p state %d socket %p", sk, sk->sk_state, sk->sk_socket);
711
712 switch (sk->sk_state) {
713 case BT_LISTEN:
714 l2cap_sock_cleanup_listen(sk);
715 break;
716
717 case BT_CONNECTED:
718 case BT_CONFIG:
1da177e4
LT		 719 if (sk->sk_type == SOCK_SEQPACKET) {
720 struct l2cap_conn *conn = l2cap_pi(sk)->conn;
1da177e4
LT		 721
722 sk->sk_state = BT_DISCONN;
723 l2cap_sock_set_timer(sk, sk->sk_sndtimeo);
22121fc9 724 l2cap_send_disconn_req(conn, sk);
b1235d79 725 } else
1da177e4 726 l2cap_chan_del(sk, reason);
1da177e4
LT		 727 break;
728
f66dc81f
MH		 729 case BT_CONNECT2:
730 if (sk->sk_type == SOCK_SEQPACKET) {
731 struct l2cap_conn *conn = l2cap_pi(sk)->conn;
732 struct l2cap_conn_rsp rsp;
733 __u16 result;
734
735 if (bt_sk(sk)->defer_setup)
736 result = L2CAP_CR_SEC_BLOCK;
737 else
738 result = L2CAP_CR_BAD_PSM;
739
740 rsp.scid = cpu_to_le16(l2cap_pi(sk)->dcid);
741 rsp.dcid = cpu_to_le16(l2cap_pi(sk)->scid);
742 rsp.result = cpu_to_le16(result);
743 rsp.status = cpu_to_le16(L2CAP_CS_NO_INFO);
744 l2cap_send_cmd(conn, l2cap_pi(sk)->ident,
745 L2CAP_CONN_RSP, sizeof(rsp), &rsp);
746 } else
747 l2cap_chan_del(sk, reason);
748 break;
749
1da177e4
LT		 750 case BT_CONNECT:
751 case BT_DISCONN:
752 l2cap_chan_del(sk, reason);
753 break;
754
755 default:
756 sock_set_flag(sk, SOCK_ZAPPED);
757 break;
758 }
759}
760
761/* Must be called on unlocked socket. */
762static void l2cap_sock_close(struct sock *sk)
763{
764 l2cap_sock_clear_timer(sk);
765 lock_sock(sk);
766 __l2cap_sock_close(sk, ECONNRESET);
767 release_sock(sk);
768 l2cap_sock_kill(sk);
769}
770
771static void l2cap_sock_init(struct sock *sk, struct sock *parent)
772{
773 struct l2cap_pinfo *pi = l2cap_pi(sk);
774
775 BT_DBG("sk %p", sk);
776
777 if (parent) {
778 sk->sk_type = parent->sk_type;
f66dc81f
MH		 779 bt_sk(sk)->defer_setup = bt_sk(parent)->defer_setup;
780
1da177e4
LT		 781 pi->imtu = l2cap_pi(parent)->imtu;
782 pi->omtu = l2cap_pi(parent)->omtu;
c6b03cf9
MH		 783 pi->mode = l2cap_pi(parent)->mode;
784 pi->fcs = l2cap_pi(parent)->fcs;
2af6b9d5
MH		 785 pi->sec_level = l2cap_pi(parent)->sec_level;
786 pi->role_switch = l2cap_pi(parent)->role_switch;
787 pi->force_reliable = l2cap_pi(parent)->force_reliable;
1da177e4
LT		 788 } else {
789 pi->imtu = L2CAP_DEFAULT_MTU;
790 pi->omtu = 0;
c6b03cf9
MH		 791 pi->mode = L2CAP_MODE_BASIC;
792 pi->fcs = L2CAP_FCS_CRC16;
2af6b9d5
MH		 793 pi->sec_level = BT_SECURITY_LOW;
794 pi->role_switch = 0;
795 pi->force_reliable = 0;
1da177e4
LT		 796 }
797
798 /* Default config options */
5dee9e7c 799 pi->conf_len = 0;
1da177e4 800 pi->flush_to = L2CAP_DEFAULT_FLUSH_TO;
45054dc1
DY		 801 skb_queue_head_init(TX_QUEUE(sk));
802 skb_queue_head_init(SREJ_QUEUE(sk));
803 INIT_LIST_HEAD(SREJ_LIST(sk));
1da177e4
LT		 804}
805
806static struct proto l2cap_proto = {
807 .name = "L2CAP",
808 .owner = THIS_MODULE,
809 .obj_size = sizeof(struct l2cap_pinfo)
810};
811
1b8d7ae4 812static struct sock *l2cap_sock_alloc(struct net *net, struct socket *sock, int proto, gfp_t prio)
1da177e4
LT		 813{
814 struct sock *sk;
815
6257ff21 816 sk = sk_alloc(net, PF_BLUETOOTH, prio, &l2cap_proto);
1da177e4
LT		 817 if (!sk)
818 return NULL;
819
820 sock_init_data(sock, sk);
821 INIT_LIST_HEAD(&bt_sk(sk)->accept_q);
822
823 sk->sk_destruct = l2cap_sock_destruct;
4e8402a3 824 sk->sk_sndtimeo = msecs_to_jiffies(L2CAP_CONN_TIMEOUT);
1da177e4
LT		 825
826 sock_reset_flag(sk, SOCK_ZAPPED);
827
828 sk->sk_protocol = proto;
b1235d79 829 sk->sk_state = BT_OPEN;
1da177e4 830
b1235d79 831 setup_timer(&sk->sk_timer, l2cap_sock_timeout, (unsigned long) sk);
1da177e4
LT		 832
833 bt_sock_link(&l2cap_sk_list, sk);
834 return sk;
835}
836
3f378b68
EP		 837static int l2cap_sock_create(struct net *net, struct socket *sock, int protocol,
838 int kern)
1da177e4
LT		 839{
840 struct sock *sk;
841
842 BT_DBG("sock %p", sock);
843
844 sock->state = SS_UNCONNECTED;
845
846 if (sock->type != SOCK_SEQPACKET &&
847 sock->type != SOCK_DGRAM && sock->type != SOCK_RAW)
848 return -ESOCKTNOSUPPORT;
849
c84b3268 850 if (sock->type == SOCK_RAW && !kern && !capable(CAP_NET_RAW))
1da177e4
LT		 851 return -EPERM;
852
853 sock->ops = &l2cap_sock_ops;
854
1b8d7ae4 855 sk = l2cap_sock_alloc(net, sock, protocol, GFP_ATOMIC);
1da177e4
LT		 856 if (!sk)
857 return -ENOMEM;
858
859 l2cap_sock_init(sk, NULL);
860 return 0;
861}
862
f29972de 863static int l2cap_sock_bind(struct socket *sock, struct sockaddr *addr, int alen)
1da177e4 864{
1da177e4 865 struct sock *sk = sock->sk;
f29972de
MH		 866 struct sockaddr_l2 la;
867 int len, err = 0;
1da177e4 868
f29972de 869 BT_DBG("sk %p", sk);
1da177e4
LT		 870
871 if (!addr || addr->sa_family != AF_BLUETOOTH)
872 return -EINVAL;
873
f29972de
MH		 874 memset(&la, 0, sizeof(la));
875 len = min_t(unsigned int, sizeof(la), alen);
876 memcpy(&la, addr, len);
877
2a517ca6
MH		 878 if (la.l2_cid)
879 return -EINVAL;
880
1da177e4
LT		 881 lock_sock(sk);
882
883 if (sk->sk_state != BT_OPEN) {
884 err = -EBADFD;
885 goto done;
886 }
887
b4324b5d 888 if (la.l2_psm && __le16_to_cpu(la.l2_psm) < 0x1001 &&
847641d7
MH		 889 !capable(CAP_NET_BIND_SERVICE)) {
890 err = -EACCES;
891 goto done;
892 }
8e87d142 893
1da177e4
LT		 894 write_lock_bh(&l2cap_sk_list.lock);
895
f29972de 896 if (la.l2_psm && __l2cap_get_sock_by_addr(la.l2_psm, &la.l2_bdaddr)) {
1da177e4
LT		 897 err = -EADDRINUSE;
898 } else {
899 /* Save source address */
f29972de
MH		 900 bacpy(&bt_sk(sk)->src, &la.l2_bdaddr);
901 l2cap_pi(sk)->psm = la.l2_psm;
902 l2cap_pi(sk)->sport = la.l2_psm;
1da177e4 903 sk->sk_state = BT_BOUND;
2af6b9d5 904
b4324b5d
MH		 905 if (__le16_to_cpu(la.l2_psm) == 0x0001 ||
906 __le16_to_cpu(la.l2_psm) == 0x0003)
2af6b9d5 907 l2cap_pi(sk)->sec_level = BT_SECURITY_SDP;
1da177e4
LT		 908 }
909
910 write_unlock_bh(&l2cap_sk_list.lock);
911
912done:
913 release_sock(sk);
914 return err;
915}
916
917static int l2cap_do_connect(struct sock *sk)
918{
919 bdaddr_t *src = &bt_sk(sk)->src;
920 bdaddr_t *dst = &bt_sk(sk)->dst;
921 struct l2cap_conn *conn;
922 struct hci_conn *hcon;
923 struct hci_dev *hdev;
09ab6f4c 924 __u8 auth_type;
44d0e48e 925 int err;
1da177e4 926
f29972de
MH		 927 BT_DBG("%s -> %s psm 0x%2.2x", batostr(src), batostr(dst),
928 l2cap_pi(sk)->psm);
1da177e4 929
af05b30b
GP		 930 hdev = hci_get_route(dst, src);
931 if (!hdev)
1da177e4
LT		 932 return -EHOSTUNREACH;
933
934 hci_dev_lock_bh(hdev);
935
936 err = -ENOMEM;
937
8c1b2355 938 if (sk->sk_type == SOCK_RAW) {
2af6b9d5
MH		 939 switch (l2cap_pi(sk)->sec_level) {
940 case BT_SECURITY_HIGH:
8c1b2355 941 auth_type = HCI_AT_DEDICATED_BONDING_MITM;
2af6b9d5
MH		 942 break;
943 case BT_SECURITY_MEDIUM:
8c1b2355 944 auth_type = HCI_AT_DEDICATED_BONDING;
2af6b9d5
MH		 945 break;
946 default:
09ab6f4c 947 auth_type = HCI_AT_NO_BONDING;
2af6b9d5
MH		 948 break;
949 }
8c1b2355 950 } else if (l2cap_pi(sk)->psm == cpu_to_le16(0x0001)) {
2af6b9d5 951 if (l2cap_pi(sk)->sec_level == BT_SECURITY_HIGH)
8c1b2355 952 auth_type = HCI_AT_NO_BONDING_MITM;
09ab6f4c 953 else
8c1b2355 954 auth_type = HCI_AT_NO_BONDING;
435fef20
MH		 955
956 if (l2cap_pi(sk)->sec_level == BT_SECURITY_LOW)
957 l2cap_pi(sk)->sec_level = BT_SECURITY_SDP;
8c1b2355 958 } else {
2af6b9d5
MH		 959 switch (l2cap_pi(sk)->sec_level) {
960 case BT_SECURITY_HIGH:
8c1b2355 961 auth_type = HCI_AT_GENERAL_BONDING_MITM;
2af6b9d5
MH		 962 break;
963 case BT_SECURITY_MEDIUM:
09ab6f4c 964 auth_type = HCI_AT_GENERAL_BONDING;
2af6b9d5
MH		 965 break;
966 default:
8c1b2355 967 auth_type = HCI_AT_NO_BONDING;
2af6b9d5
MH		 968 break;
969 }
09ab6f4c
MH		 970 }
971
2af6b9d5
MH		 972 hcon = hci_connect(hdev, ACL_LINK, dst,
973 l2cap_pi(sk)->sec_level, auth_type);
1da177e4
LT		 974 if (!hcon)
975 goto done;
976
977 conn = l2cap_conn_add(hcon, 0);
978 if (!conn) {
979 hci_conn_put(hcon);
980 goto done;
981 }
982
983 err = 0;
984
985 /* Update source addr of the socket */
986 bacpy(src, conn->src);
987
988 l2cap_chan_add(conn, sk, NULL);
989
990 sk->sk_state = BT_CONNECT;
991 l2cap_sock_set_timer(sk, sk->sk_sndtimeo);
992
993 if (hcon->state == BT_CONNECTED) {
79d554a6 994 if (sk->sk_type != SOCK_SEQPACKET) {
1da177e4
LT		 995 l2cap_sock_clear_timer(sk);
996 sk->sk_state = BT_CONNECTED;
79d554a6
MH		 997 } else
998 l2cap_do_start(sk);
1da177e4
LT		 999 }
1000
1001done:
1002 hci_dev_unlock_bh(hdev);
1003 hci_dev_put(hdev);
1004 return err;
1005}
1006
1007static int l2cap_sock_connect(struct socket *sock, struct sockaddr *addr, int alen, int flags)
1008{
1da177e4 1009 struct sock *sk = sock->sk;
f29972de
MH		 1010 struct sockaddr_l2 la;
1011 int len, err = 0;
1da177e4 1012
1da177e4
LT		 1013 BT_DBG("sk %p", sk);
1014
6503d961
CG		 1015 if (!addr || alen < sizeof(addr->sa_family) ||
1016 addr->sa_family != AF_BLUETOOTH)
2a517ca6 1017 return -EINVAL;
1da177e4 1018
f29972de
MH		 1019 memset(&la, 0, sizeof(la));
1020 len = min_t(unsigned int, sizeof(la), alen);
1021 memcpy(&la, addr, len);
1022
2a517ca6
MH		 1023 if (la.l2_cid)
1024 return -EINVAL;
1025
1026 lock_sock(sk);
1027
f29972de 1028 if (sk->sk_type == SOCK_SEQPACKET && !la.l2_psm) {
1da177e4
LT		 1029 err = -EINVAL;
1030 goto done;
1031 }
1032
c6b03cf9
MH		 1033 switch (l2cap_pi(sk)->mode) {
1034 case L2CAP_MODE_BASIC:
1035 break;
1036 case L2CAP_MODE_ERTM:
f2fcfcd6 1037 case L2CAP_MODE_STREAMING:
c6b03cf9
MH		 1038 if (enable_ertm)
1039 break;
1040 /* fall through */
1041 default:
1042 err = -ENOTSUPP;
1043 goto done;
1044 }
1045
af05b30b 1046 switch (sk->sk_state) {
1da177e4
LT		 1047 case BT_CONNECT:
1048 case BT_CONNECT2:
1049 case BT_CONFIG:
1050 /* Already connecting */
1051 goto wait;
1052
1053 case BT_CONNECTED:
1054 /* Already connected */
1055 goto done;
1056
1057 case BT_OPEN:
1058 case BT_BOUND:
1059 /* Can connect */
1060 break;
1061
1062 default:
1063 err = -EBADFD;
1064 goto done;
1065 }
1066
1067 /* Set destination address and psm */
f29972de
MH		 1068 bacpy(&bt_sk(sk)->dst, &la.l2_bdaddr);
1069 l2cap_pi(sk)->psm = la.l2_psm;
1da177e4 1070
af05b30b
GP		 1071 err = l2cap_do_connect(sk);
1072 if (err)
1da177e4
LT		 1073 goto done;
1074
1075wait:
1076 err = bt_sock_wait_state(sk, BT_CONNECTED,
1077 sock_sndtimeo(sk, flags & O_NONBLOCK));
1078done:
1079 release_sock(sk);
1080 return err;
1081}
1082
1083static int l2cap_sock_listen(struct socket *sock, int backlog)
1084{
1085 struct sock *sk = sock->sk;
1086 int err = 0;
1087
1088 BT_DBG("sk %p backlog %d", sk, backlog);
1089
1090 lock_sock(sk);
1091
1092 if (sk->sk_state != BT_BOUND || sock->type != SOCK_SEQPACKET) {
1093 err = -EBADFD;
1094 goto done;
1095 }
1096
c6b03cf9
MH		 1097 switch (l2cap_pi(sk)->mode) {
1098 case L2CAP_MODE_BASIC:
1099 break;
1100 case L2CAP_MODE_ERTM:
f2fcfcd6 1101 case L2CAP_MODE_STREAMING:
c6b03cf9
MH		 1102 if (enable_ertm)
1103 break;
1104 /* fall through */
1105 default:
1106 err = -ENOTSUPP;
1107 goto done;
1108 }
1109
1da177e4
LT		 1110 if (!l2cap_pi(sk)->psm) {
1111 bdaddr_t *src = &bt_sk(sk)->src;
1112 u16 psm;
1113
1114 err = -EINVAL;
1115
1116 write_lock_bh(&l2cap_sk_list.lock);
1117
1118 for (psm = 0x1001; psm < 0x1100; psm += 2)
b4324b5d
MH		 1119 if (!__l2cap_get_sock_by_addr(cpu_to_le16(psm), src)) {
1120 l2cap_pi(sk)->psm = cpu_to_le16(psm);
1121 l2cap_pi(sk)->sport = cpu_to_le16(psm);
1da177e4
LT		 1122 err = 0;
1123 break;
1124 }
1125
1126 write_unlock_bh(&l2cap_sk_list.lock);
1127
1128 if (err < 0)
1129 goto done;
1130 }
1131
1132 sk->sk_max_ack_backlog = backlog;
1133 sk->sk_ack_backlog = 0;
1134 sk->sk_state = BT_LISTEN;
1135
1136done:
1137 release_sock(sk);
1138 return err;
1139}
1140
1141static int l2cap_sock_accept(struct socket *sock, struct socket *newsock, int flags)
1142{
1143 DECLARE_WAITQUEUE(wait, current);
1144 struct sock *sk = sock->sk, *nsk;
1145 long timeo;
1146 int err = 0;
1147
fcc70d5f 1148 lock_sock_nested(sk, SINGLE_DEPTH_NESTING);
1da177e4
LT		 1149
1150 if (sk->sk_state != BT_LISTEN) {
1151 err = -EBADFD;
1152 goto done;
1153 }
1154
1155 timeo = sock_rcvtimeo(sk, flags & O_NONBLOCK);
1156
1157 BT_DBG("sk %p timeo %ld", sk, timeo);
1158
1159 /* Wait for an incoming connection. (wake-one). */
aa395145 1160 add_wait_queue_exclusive(sk_sleep(sk), &wait);
1da177e4
LT		 1161 while (!(nsk = bt_accept_dequeue(sk, newsock))) {
1162 set_current_state(TASK_INTERRUPTIBLE);
1163 if (!timeo) {
1164 err = -EAGAIN;
1165 break;
1166 }
1167
1168 release_sock(sk);
1169 timeo = schedule_timeout(timeo);
fcc70d5f 1170 lock_sock_nested(sk, SINGLE_DEPTH_NESTING);
1da177e4
LT		 1171
1172 if (sk->sk_state != BT_LISTEN) {
1173 err = -EBADFD;
1174 break;
1175 }
1176
1177 if (signal_pending(current)) {
1178 err = sock_intr_errno(timeo);
1179 break;
1180 }
1181 }
1182 set_current_state(TASK_RUNNING);
aa395145 1183 remove_wait_queue(sk_sleep(sk), &wait);
1da177e4
LT		 1184
1185 if (err)
1186 goto done;
1187
1188 newsock->state = SS_CONNECTED;
1189
1190 BT_DBG("new socket %p", nsk);
1191
1192done:
1193 release_sock(sk);
1194 return err;
1195}
1196
1197static int l2cap_sock_getname(struct socket *sock, struct sockaddr *addr, int *len, int peer)
1198{
1199 struct sockaddr_l2 *la = (struct sockaddr_l2 *) addr;
1200 struct sock *sk = sock->sk;
1201
1202 BT_DBG("sock %p, sk %p", sock, sk);
1203
1204 addr->sa_family = AF_BLUETOOTH;
1205 *len = sizeof(struct sockaddr_l2);
1206
f29972de
MH		 1207 if (peer) {
1208 la->l2_psm = l2cap_pi(sk)->psm;
1da177e4 1209 bacpy(&la->l2_bdaddr, &bt_sk(sk)->dst);
b4324b5d 1210 la->l2_cid = cpu_to_le16(l2cap_pi(sk)->dcid);
f29972de
MH		 1211 } else {
1212 la->l2_psm = l2cap_pi(sk)->sport;
1da177e4 1213 bacpy(&la->l2_bdaddr, &bt_sk(sk)->src);
b4324b5d 1214 la->l2_cid = cpu_to_le16(l2cap_pi(sk)->scid);
f29972de 1215 }
1da177e4 1216
1da177e4
LT		 1217 return 0;
1218}
1219
e90bac06
GP		 1220static void l2cap_monitor_timeout(unsigned long arg)
1221{
1222 struct sock *sk = (void *) arg;
1223 u16 control;
1224
e686219a 1225 bh_lock_sock(sk);
e90bac06
GP		 1226 if (l2cap_pi(sk)->retry_count >= l2cap_pi(sk)->remote_max_tx) {
1227 l2cap_send_disconn_req(l2cap_pi(sk)->conn, sk);
b13f5860 1228 bh_unlock_sock(sk);
e90bac06
GP		 1229 return;
1230 }
1231
1232 l2cap_pi(sk)->retry_count++;
1233 __mod_monitor_timer();
1234
1235 control = L2CAP_CTRL_POLL;
7e743090 1236 l2cap_send_rr_or_rnr(l2cap_pi(sk), control);
e686219a 1237 bh_unlock_sock(sk);
e90bac06
GP		 1238}
1239
1240static void l2cap_retrans_timeout(unsigned long arg)
1241{
1242 struct sock *sk = (void *) arg;
1243 u16 control;
1244
e686219a 1245 bh_lock_sock(sk);
e90bac06
GP		 1246 l2cap_pi(sk)->retry_count = 1;
1247 __mod_monitor_timer();
1248
1249 l2cap_pi(sk)->conn_state |= L2CAP_CONN_WAIT_F;
1250
1251 control = L2CAP_CTRL_POLL;
7e743090 1252 l2cap_send_rr_or_rnr(l2cap_pi(sk), control);
e686219a 1253 bh_unlock_sock(sk);
e90bac06
GP		 1254}
1255
1c2acffb 1256static void l2cap_drop_acked_frames(struct sock *sk)
1da177e4 1257{
1c2acffb 1258 struct sk_buff *skb;
1da177e4 1259
1c2acffb
GP		 1260 while ((skb = skb_peek(TX_QUEUE(sk)))) {
1261 if (bt_cb(skb)->tx_seq == l2cap_pi(sk)->expected_ack_seq)
1262 break;
1da177e4 1263
1c2acffb
GP		 1264 skb = skb_dequeue(TX_QUEUE(sk));
1265 kfree_skb(skb);
1da177e4 1266
1c2acffb
GP		 1267 l2cap_pi(sk)->unacked_frames--;
1268 }
1da177e4 1269
e90bac06
GP		 1270 if (!l2cap_pi(sk)->unacked_frames)
1271 del_timer(&l2cap_pi(sk)->retrans_timer);
1272
1c2acffb
GP		 1273 return;
1274}
1da177e4 1275
1c2acffb
GP		 1276static inline int l2cap_do_send(struct sock *sk, struct sk_buff *skb)
1277{
1278 struct l2cap_pinfo *pi = l2cap_pi(sk);
1279 int err;
1280
1281 BT_DBG("sk %p, skb %p len %d", sk, skb, skb->len);
1da177e4 1282
1c2acffb
GP		 1283 err = hci_send_acl(pi->conn->hcon, skb, 0);
1284 if (err < 0)
1285 kfree_skb(skb);
1286
1287 return err;
1288}
1289
6840ed07
GP		 1290static int l2cap_streaming_send(struct sock *sk)
1291{
1292 struct sk_buff *skb, *tx_skb;
1293 struct l2cap_pinfo *pi = l2cap_pi(sk);
fcc203c3 1294 u16 control, fcs;
6840ed07
GP		 1295 int err;
1296
1297 while ((skb = sk->sk_send_head)) {
1298 tx_skb = skb_clone(skb, GFP_ATOMIC);
1299
1300 control = get_unaligned_le16(tx_skb->data + L2CAP_HDR_SIZE);
1301 control |= pi->next_tx_seq << L2CAP_CTRL_TXSEQ_SHIFT;
1302 put_unaligned_le16(control, tx_skb->data + L2CAP_HDR_SIZE);
1303
e8235c6b 1304 if (pi->fcs == L2CAP_FCS_CRC16) {
fcc203c3
GP		 1305 fcs = crc16(0, (u8 *)tx_skb->data, tx_skb->len - 2);
1306 put_unaligned_le16(fcs, tx_skb->data + tx_skb->len - 2);
1307 }
1308
6840ed07
GP		 1309 err = l2cap_do_send(sk, tx_skb);
1310 if (err < 0) {
1311 l2cap_send_disconn_req(pi->conn, sk);
1312 return err;
1313 }
1314
1315 pi->next_tx_seq = (pi->next_tx_seq + 1) % 64;
1316
1317 if (skb_queue_is_last(TX_QUEUE(sk), skb))
1318 sk->sk_send_head = NULL;
1319 else
1320 sk->sk_send_head = skb_queue_next(TX_QUEUE(sk), skb);
1321
1322 skb = skb_dequeue(TX_QUEUE(sk));
1323 kfree_skb(skb);
1324 }
1325 return 0;
1326}
1327
8f17154f
GP		 1328static int l2cap_retransmit_frame(struct sock *sk, u8 tx_seq)
1329{
1330 struct l2cap_pinfo *pi = l2cap_pi(sk);
1331 struct sk_buff *skb, *tx_skb;
1332 u16 control, fcs;
1333 int err;
1334
1335 skb = skb_peek(TX_QUEUE(sk));
1336 do {
1337 if (bt_cb(skb)->tx_seq != tx_seq) {
1338 if (skb_queue_is_last(TX_QUEUE(sk), skb))
1339 break;
1340 skb = skb_queue_next(TX_QUEUE(sk), skb);
1341 continue;
1342 }
1343
1344 if (pi->remote_max_tx &&
1345 bt_cb(skb)->retries == pi->remote_max_tx) {
1346 l2cap_send_disconn_req(pi->conn, sk);
1347 break;
1348 }
1349
1350 tx_skb = skb_clone(skb, GFP_ATOMIC);
1351 bt_cb(skb)->retries++;
1352 control = get_unaligned_le16(tx_skb->data + L2CAP_HDR_SIZE);
9f121a5a 1353 control |= (pi->buffer_seq << L2CAP_CTRL_REQSEQ_SHIFT)
8f17154f
GP		 1354 | (tx_seq << L2CAP_CTRL_TXSEQ_SHIFT);
1355 put_unaligned_le16(control, tx_skb->data + L2CAP_HDR_SIZE);
1356
e8235c6b 1357 if (pi->fcs == L2CAP_FCS_CRC16) {
8f17154f
GP		 1358 fcs = crc16(0, (u8 *)tx_skb->data, tx_skb->len - 2);
1359 put_unaligned_le16(fcs, tx_skb->data + tx_skb->len - 2);
1360 }
1361
1362 err = l2cap_do_send(sk, tx_skb);
1363 if (err < 0) {
1364 l2cap_send_disconn_req(pi->conn, sk);
1365 return err;
1366 }
1367 break;
1368 } while(1);
1369 return 0;
1370}
1371
1c2acffb
GP		 1372static int l2cap_ertm_send(struct sock *sk)
1373{
1374 struct sk_buff *skb, *tx_skb;
1375 struct l2cap_pinfo *pi = l2cap_pi(sk);
fcc203c3 1376 u16 control, fcs;
9e917af1 1377 int err, nsent = 0;
1c2acffb 1378
e90bac06
GP		 1379 if (pi->conn_state & L2CAP_CONN_WAIT_F)
1380 return 0;
1381
f64f9e71
JP		 1382 while ((skb = sk->sk_send_head) && (!l2cap_tx_window_full(sk)) &&
1383 !(pi->conn_state & L2CAP_CONN_REMOTE_BUSY)) {
1c2acffb 1384
e90bac06
GP		 1385 if (pi->remote_max_tx &&
1386 bt_cb(skb)->retries == pi->remote_max_tx) {
1387 l2cap_send_disconn_req(pi->conn, sk);
1388 break;
1389 }
1390
e420aba3
AE		 1391 tx_skb = skb_clone(skb, GFP_ATOMIC);
1392
e90bac06
GP		 1393 bt_cb(skb)->retries++;
1394
1c2acffb 1395 control = get_unaligned_le16(tx_skb->data + L2CAP_HDR_SIZE);
d5392c8f
GP		 1396 if (pi->conn_state & L2CAP_CONN_SEND_FBIT) {
1397 control |= L2CAP_CTRL_FINAL;
1398 pi->conn_state &= ~L2CAP_CONN_SEND_FBIT;
1399 }
9f121a5a 1400 control |= (pi->buffer_seq << L2CAP_CTRL_REQSEQ_SHIFT)
1c2acffb
GP		 1401 | (pi->next_tx_seq << L2CAP_CTRL_TXSEQ_SHIFT);
1402 put_unaligned_le16(control, tx_skb->data + L2CAP_HDR_SIZE);
1403
e90bac06 1404
e8235c6b 1405 if (pi->fcs == L2CAP_FCS_CRC16) {
fcc203c3
GP		 1406 fcs = crc16(0, (u8 *)skb->data, tx_skb->len - 2);
1407 put_unaligned_le16(fcs, skb->data + tx_skb->len - 2);
1408 }
1409
1c2acffb
GP		 1410 err = l2cap_do_send(sk, tx_skb);
1411 if (err < 0) {
1412 l2cap_send_disconn_req(pi->conn, sk);
1413 return err;
1414 }
e90bac06 1415 __mod_retrans_timer();
1c2acffb
GP		 1416
1417 bt_cb(skb)->tx_seq = pi->next_tx_seq;
1418 pi->next_tx_seq = (pi->next_tx_seq + 1) % 64;
1419
1420 pi->unacked_frames++;
d5392c8f 1421 pi->frames_sent++;
1c2acffb
GP		 1422
1423 if (skb_queue_is_last(TX_QUEUE(sk), skb))
1424 sk->sk_send_head = NULL;
1425 else
1426 sk->sk_send_head = skb_queue_next(TX_QUEUE(sk), skb);
9e917af1
GP		 1427
1428 nsent++;
1c2acffb
GP		 1429 }
1430
9e917af1
GP		 1431 return nsent;
1432}
1433
1434static int l2cap_send_ack(struct l2cap_pinfo *pi)
1435{
1436 struct sock *sk = (struct sock *)pi;
1437 u16 control = 0;
1438
1439 control |= pi->buffer_seq << L2CAP_CTRL_REQSEQ_SHIFT;
1440
1441 if (pi->conn_state & L2CAP_CONN_LOCAL_BUSY) {
1442 control |= L2CAP_SUPER_RCV_NOT_READY;
1443 return l2cap_send_sframe(pi, control);
1444 } else if (l2cap_ertm_send(sk) == 0) {
1445 control |= L2CAP_SUPER_RCV_READY;
1446 return l2cap_send_sframe(pi, control);
1447 }
1c2acffb
GP		 1448 return 0;
1449}
1450
99b0d4b7
GP		 1451static int l2cap_send_srejtail(struct sock *sk)
1452{
1453 struct srej_list *tail;
1454 u16 control;
1455
1456 control = L2CAP_SUPER_SELECT_REJECT;
1457 control |= L2CAP_CTRL_FINAL;
1458
1459 tail = list_entry(SREJ_LIST(sk)->prev, struct srej_list, list);
1460 control |= tail->tx_seq << L2CAP_CTRL_REQSEQ_SHIFT;
1461
1462 l2cap_send_sframe(l2cap_pi(sk), control);
1463
1464 return 0;
1465}
1466
1c2acffb
GP		 1467static inline int l2cap_skbuff_fromiovec(struct sock *sk, struct msghdr *msg, int len, int count, struct sk_buff *skb)
1468{
1469 struct l2cap_conn *conn = l2cap_pi(sk)->conn;
1470 struct sk_buff **frag;
1471 int err, sent = 0;
1da177e4
LT		 1472
1473 if (memcpy_fromiovec(skb_put(skb, count), msg->msg_iov, count)) {
1c2acffb 1474 return -EFAULT;
1da177e4
LT		 1475 }
1476
1477 sent += count;
1478 len -= count;
1479
1480 /* Continuation fragments (no L2CAP header) */
1481 frag = &skb_shinfo(skb)->frag_list;
1482 while (len) {
1483 count = min_t(unsigned int, conn->mtu, len);
1484
1485 *frag = bt_skb_send_alloc(sk, count, msg->msg_flags & MSG_DONTWAIT, &err);
1486 if (!*frag)
1c2acffb
GP		 1487 return -EFAULT;
1488 if (memcpy_fromiovec(skb_put(*frag, count), msg->msg_iov, count))
1489 return -EFAULT;
1da177e4
LT		 1490
1491 sent += count;
1492 len -= count;
1493
1494 frag = &(*frag)->next;
1495 }
1da177e4
LT		 1496
1497 return sent;
1c2acffb 1498}
1da177e4 1499
1c2acffb
GP		 1500static struct sk_buff *l2cap_create_connless_pdu(struct sock *sk, struct msghdr *msg, size_t len)
1501{
1502 struct l2cap_conn *conn = l2cap_pi(sk)->conn;
1503 struct sk_buff *skb;
1504 int err, count, hlen = L2CAP_HDR_SIZE + 2;
1505 struct l2cap_hdr *lh;
1506
1507 BT_DBG("sk %p len %d", sk, (int)len);
1508
1509 count = min_t(unsigned int, (conn->mtu - hlen), len);
1510 skb = bt_skb_send_alloc(sk, count + hlen,
1511 msg->msg_flags & MSG_DONTWAIT, &err);
1512 if (!skb)
1513 return ERR_PTR(-ENOMEM);
1514
1515 /* Create L2CAP header */
1516 lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE);
1517 lh->cid = cpu_to_le16(l2cap_pi(sk)->dcid);
1518 lh->len = cpu_to_le16(len + (hlen - L2CAP_HDR_SIZE));
1519 put_unaligned_le16(l2cap_pi(sk)->psm, skb_put(skb, 2));
1520
1521 err = l2cap_skbuff_fromiovec(sk, msg, len, count, skb);
1522 if (unlikely(err < 0)) {
1523 kfree_skb(skb);
1524 return ERR_PTR(err);
1525 }
1526 return skb;
1527}
1528
1529static struct sk_buff *l2cap_create_basic_pdu(struct sock *sk, struct msghdr *msg, size_t len)
1530{
1531 struct l2cap_conn *conn = l2cap_pi(sk)->conn;
1532 struct sk_buff *skb;
1533 int err, count, hlen = L2CAP_HDR_SIZE;
1534 struct l2cap_hdr *lh;
1535
1536 BT_DBG("sk %p len %d", sk, (int)len);
1537
1538 count = min_t(unsigned int, (conn->mtu - hlen), len);
1539 skb = bt_skb_send_alloc(sk, count + hlen,
1540 msg->msg_flags & MSG_DONTWAIT, &err);
1541 if (!skb)
1542 return ERR_PTR(-ENOMEM);
1543
1544 /* Create L2CAP header */
1545 lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE);
1546 lh->cid = cpu_to_le16(l2cap_pi(sk)->dcid);
1547 lh->len = cpu_to_le16(len + (hlen - L2CAP_HDR_SIZE));
1548
1549 err = l2cap_skbuff_fromiovec(sk, msg, len, count, skb);
1550 if (unlikely(err < 0)) {
1551 kfree_skb(skb);
1552 return ERR_PTR(err);
1553 }
1554 return skb;
1555}
1556
6840ed07 1557static struct sk_buff *l2cap_create_iframe_pdu(struct sock *sk, struct msghdr *msg, size_t len, u16 control, u16 sdulen)
1c2acffb
GP		 1558{
1559 struct l2cap_conn *conn = l2cap_pi(sk)->conn;
1560 struct sk_buff *skb;
1561 int err, count, hlen = L2CAP_HDR_SIZE + 2;
1562 struct l2cap_hdr *lh;
1563
1564 BT_DBG("sk %p len %d", sk, (int)len);
1565
c74e560c
GP		 1566 if (sdulen)
1567 hlen += 2;
1568
fcc203c3
GP		 1569 if (l2cap_pi(sk)->fcs == L2CAP_FCS_CRC16)
1570 hlen += 2;
1571
1c2acffb
GP		 1572 count = min_t(unsigned int, (conn->mtu - hlen), len);
1573 skb = bt_skb_send_alloc(sk, count + hlen,
1574 msg->msg_flags & MSG_DONTWAIT, &err);
1575 if (!skb)
1576 return ERR_PTR(-ENOMEM);
1577
1578 /* Create L2CAP header */
1579 lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE);
1580 lh->cid = cpu_to_le16(l2cap_pi(sk)->dcid);
1581 lh->len = cpu_to_le16(len + (hlen - L2CAP_HDR_SIZE));
1582 put_unaligned_le16(control, skb_put(skb, 2));
c74e560c
GP		 1583 if (sdulen)
1584 put_unaligned_le16(sdulen, skb_put(skb, 2));
1c2acffb
GP		 1585
1586 err = l2cap_skbuff_fromiovec(sk, msg, len, count, skb);
1587 if (unlikely(err < 0)) {
1588 kfree_skb(skb);
1589 return ERR_PTR(err);
1590 }
e90bac06 1591
fcc203c3
GP		 1592 if (l2cap_pi(sk)->fcs == L2CAP_FCS_CRC16)
1593 put_unaligned_le16(0, skb_put(skb, 2));
1594
e90bac06 1595 bt_cb(skb)->retries = 0;
1c2acffb 1596 return skb;
1da177e4
LT		 1597}
1598
c74e560c
GP		 1599static inline int l2cap_sar_segment_sdu(struct sock *sk, struct msghdr *msg, size_t len)
1600{
1601 struct l2cap_pinfo *pi = l2cap_pi(sk);
1602 struct sk_buff *skb;
1603 struct sk_buff_head sar_queue;
1604 u16 control;
1605 size_t size = 0;
1606
1607 __skb_queue_head_init(&sar_queue);
1608 control = L2CAP_SDU_START;
6840ed07 1609 skb = l2cap_create_iframe_pdu(sk, msg, pi->max_pdu_size, control, len);
c74e560c
GP		 1610 if (IS_ERR(skb))
1611 return PTR_ERR(skb);
1612
1613 __skb_queue_tail(&sar_queue, skb);
1614 len -= pi->max_pdu_size;
1615 size +=pi->max_pdu_size;
1616 control = 0;
1617
1618 while (len > 0) {
1619 size_t buflen;
1620
1621 if (len > pi->max_pdu_size) {
1622 control |= L2CAP_SDU_CONTINUE;
1623 buflen = pi->max_pdu_size;
1624 } else {
1625 control |= L2CAP_SDU_END;
1626 buflen = len;
1627 }
1628
6840ed07 1629 skb = l2cap_create_iframe_pdu(sk, msg, buflen, control, 0);
c74e560c
GP		 1630 if (IS_ERR(skb)) {
1631 skb_queue_purge(&sar_queue);
1632 return PTR_ERR(skb);
1633 }
1634
1635 __skb_queue_tail(&sar_queue, skb);
1636 len -= buflen;
1637 size += buflen;
1638 control = 0;
1639 }
1640 skb_queue_splice_tail(&sar_queue, TX_QUEUE(sk));
1641 if (sk->sk_send_head == NULL)
1642 sk->sk_send_head = sar_queue.next;
1643
1644 return size;
1645}
1646
1da177e4
LT		 1647static int l2cap_sock_sendmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *msg, size_t len)
1648{
1649 struct sock *sk = sock->sk;
1c2acffb
GP		 1650 struct l2cap_pinfo *pi = l2cap_pi(sk);
1651 struct sk_buff *skb;
1652 u16 control;
1653 int err;
1da177e4
LT		 1654
1655 BT_DBG("sock %p, sk %p", sock, sk);
1656
c1cbe4b7
BL		 1657 err = sock_error(sk);
1658 if (err)
1659 return err;
1da177e4
LT		 1660
1661 if (msg->msg_flags & MSG_OOB)
1662 return -EOPNOTSUPP;
1663
1da177e4
LT		 1664 lock_sock(sk);
1665
1c2acffb 1666 if (sk->sk_state != BT_CONNECTED) {
1da177e4 1667 err = -ENOTCONN;
1c2acffb
GP		 1668 goto done;
1669 }
1da177e4 1670
1c2acffb
GP		 1671 /* Connectionless channel */
1672 if (sk->sk_type == SOCK_DGRAM) {
1673 skb = l2cap_create_connless_pdu(sk, msg, len);
477fffb0
DC		 1674 if (IS_ERR(skb))
1675 err = PTR_ERR(skb);
1676 else
1677 err = l2cap_do_send(sk, skb);
1c2acffb
GP		 1678 goto done;
1679 }
1680
1681 switch (pi->mode) {
1682 case L2CAP_MODE_BASIC:
c69163e9
GP		 1683 /* Check outgoing MTU */
1684 if (len > pi->omtu) {
1685 err = -EINVAL;
1686 goto done;
1687 }
1688
1c2acffb
GP		 1689 /* Create a basic PDU */
1690 skb = l2cap_create_basic_pdu(sk, msg, len);
1691 if (IS_ERR(skb)) {
1692 err = PTR_ERR(skb);
1693 goto done;
1694 }
1695
1696 err = l2cap_do_send(sk, skb);
1697 if (!err)
1698 err = len;
1699 break;
1700
1701 case L2CAP_MODE_ERTM:
6840ed07 1702 case L2CAP_MODE_STREAMING:
1c2acffb 1703 /* Entire SDU fits into one PDU */
c74e560c 1704 if (len <= pi->max_pdu_size) {
1c2acffb 1705 control = L2CAP_SDU_UNSEGMENTED;
6840ed07 1706 skb = l2cap_create_iframe_pdu(sk, msg, len, control, 0);
1c2acffb
GP		 1707 if (IS_ERR(skb)) {
1708 err = PTR_ERR(skb);
1709 goto done;
1710 }
c74e560c
GP		 1711 __skb_queue_tail(TX_QUEUE(sk), skb);
1712 if (sk->sk_send_head == NULL)
1713 sk->sk_send_head = skb;
1c2acffb 1714 } else {
c74e560c
GP		 1715 /* Segment SDU into multiples PDUs */
1716 err = l2cap_sar_segment_sdu(sk, msg, len);
1717 if (err < 0)
1718 goto done;
1c2acffb 1719 }
1c2acffb 1720
6840ed07
GP		 1721 if (pi->mode == L2CAP_MODE_STREAMING)
1722 err = l2cap_streaming_send(sk);
1723 else
1724 err = l2cap_ertm_send(sk);
1725
9e917af1 1726 if (err >= 0)
1c2acffb
GP		 1727 err = len;
1728 break;
1729
1730 default:
1731 BT_DBG("bad state %1.1x", pi->mode);
1732 err = -EINVAL;
1733 }
1734
1735done:
1da177e4
LT		 1736 release_sock(sk);
1737 return err;
1738}
1739
f66dc81f
MH		 1740static int l2cap_sock_recvmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *msg, size_t len, int flags)
1741{
1742 struct sock *sk = sock->sk;
1743
1744 lock_sock(sk);
1745
1746 if (sk->sk_state == BT_CONNECT2 && bt_sk(sk)->defer_setup) {
1747 struct l2cap_conn_rsp rsp;
1748
1749 sk->sk_state = BT_CONFIG;
1750
1751 rsp.scid = cpu_to_le16(l2cap_pi(sk)->dcid);
1752 rsp.dcid = cpu_to_le16(l2cap_pi(sk)->scid);
1753 rsp.result = cpu_to_le16(L2CAP_CR_SUCCESS);
1754 rsp.status = cpu_to_le16(L2CAP_CS_NO_INFO);
1755 l2cap_send_cmd(l2cap_pi(sk)->conn, l2cap_pi(sk)->ident,
1756 L2CAP_CONN_RSP, sizeof(rsp), &rsp);
1757
1758 release_sock(sk);
1759 return 0;
1760 }
1761
1762 release_sock(sk);
1763
1764 return bt_sock_recvmsg(iocb, sock, msg, len, flags);
1765}
1766
b7058842 1767static int l2cap_sock_setsockopt_old(struct socket *sock, int optname, char __user *optval, unsigned int optlen)
1da177e4
LT		 1768{
1769 struct sock *sk = sock->sk;
1770 struct l2cap_options opts;
f29972de 1771 int len, err = 0;
1da177e4
LT		 1772 u32 opt;
1773
1774 BT_DBG("sk %p", sk);
1775
1776 lock_sock(sk);
1777
1778 switch (optname) {
1779 case L2CAP_OPTIONS:
0878b666
MH		 1780 opts.imtu = l2cap_pi(sk)->imtu;
1781 opts.omtu = l2cap_pi(sk)->omtu;
1782 opts.flush_to = l2cap_pi(sk)->flush_to;
c6b03cf9 1783 opts.mode = l2cap_pi(sk)->mode;
fcc203c3 1784 opts.fcs = l2cap_pi(sk)->fcs;
0878b666 1785
1da177e4
LT		 1786 len = min_t(unsigned int, sizeof(opts), optlen);
1787 if (copy_from_user((char *) &opts, optval, len)) {
1788 err = -EFAULT;
1789 break;
1790 }
0878b666 1791
c6b03cf9
MH		 1792 l2cap_pi(sk)->imtu = opts.imtu;
1793 l2cap_pi(sk)->omtu = opts.omtu;
1794 l2cap_pi(sk)->mode = opts.mode;
fcc203c3 1795 l2cap_pi(sk)->fcs = opts.fcs;
1da177e4
LT		 1796 break;
1797
1798 case L2CAP_LM:
1799 if (get_user(opt, (u32 __user *) optval)) {
1800 err = -EFAULT;
1801 break;
1802 }
1803
2af6b9d5
MH		 1804 if (opt & L2CAP_LM_AUTH)
1805 l2cap_pi(sk)->sec_level = BT_SECURITY_LOW;
1806 if (opt & L2CAP_LM_ENCRYPT)
1807 l2cap_pi(sk)->sec_level = BT_SECURITY_MEDIUM;
1808 if (opt & L2CAP_LM_SECURE)
1809 l2cap_pi(sk)->sec_level = BT_SECURITY_HIGH;
1810
1811 l2cap_pi(sk)->role_switch = (opt & L2CAP_LM_MASTER);
1812 l2cap_pi(sk)->force_reliable = (opt & L2CAP_LM_RELIABLE);
1da177e4
LT		 1813 break;
1814
1815 default:
1816 err = -ENOPROTOOPT;
1817 break;
1818 }
1819
1820 release_sock(sk);
1821 return err;
1822}
1823
b7058842 1824static int l2cap_sock_setsockopt(struct socket *sock, int level, int optname, char __user *optval, unsigned int optlen)
d58daf42
MH		 1825{
1826 struct sock *sk = sock->sk;
2af6b9d5
MH		 1827 struct bt_security sec;
1828 int len, err = 0;
f66dc81f 1829 u32 opt;
d58daf42
MH		 1830
1831 BT_DBG("sk %p", sk);
1832
1833 if (level == SOL_L2CAP)
1834 return l2cap_sock_setsockopt_old(sock, optname, optval, optlen);
1835
0588d94f
MH		 1836 if (level != SOL_BLUETOOTH)
1837 return -ENOPROTOOPT;
1838
d58daf42
MH		 1839 lock_sock(sk);
1840
1841 switch (optname) {
2af6b9d5 1842 case BT_SECURITY:
2526d3d8 1843 if (sk->sk_type != SOCK_SEQPACKET && sk->sk_type != SOCK_RAW) {
0588d94f
MH		 1844 err = -EINVAL;
1845 break;
1846 }
1847
2af6b9d5
MH		 1848 sec.level = BT_SECURITY_LOW;
1849
1850 len = min_t(unsigned int, sizeof(sec), optlen);
1851 if (copy_from_user((char *) &sec, optval, len)) {
1852 err = -EFAULT;
1853 break;
1854 }
1855
1856 if (sec.level < BT_SECURITY_LOW ||
1857 sec.level > BT_SECURITY_HIGH) {
1858 err = -EINVAL;
1859 break;
1860 }
1861
1862 l2cap_pi(sk)->sec_level = sec.level;
1863 break;
1864
f66dc81f
MH		 1865 case BT_DEFER_SETUP:
1866 if (sk->sk_state != BT_BOUND && sk->sk_state != BT_LISTEN) {
1867 err = -EINVAL;
1868 break;
1869 }
1870
1871 if (get_user(opt, (u32 __user *) optval)) {
1872 err = -EFAULT;
1873 break;
1874 }
1875
1876 bt_sk(sk)->defer_setup = opt;
1877 break;
1878
d58daf42
MH		 1879 default:
1880 err = -ENOPROTOOPT;
1881 break;
1882 }
1883
1884 release_sock(sk);
1885 return err;
1886}
1887
1888static int l2cap_sock_getsockopt_old(struct socket *sock, int optname, char __user *optval, int __user *optlen)
1da177e4
LT		 1889{
1890 struct sock *sk = sock->sk;
1891 struct l2cap_options opts;
1892 struct l2cap_conninfo cinfo;
1893 int len, err = 0;
2af6b9d5 1894 u32 opt;
1da177e4
LT		 1895
1896 BT_DBG("sk %p", sk);
1897
1898 if (get_user(len, optlen))
1899 return -EFAULT;
1900
1901 lock_sock(sk);
1902
1903 switch (optname) {
1904 case L2CAP_OPTIONS:
1905 opts.imtu = l2cap_pi(sk)->imtu;
1906 opts.omtu = l2cap_pi(sk)->omtu;
1907 opts.flush_to = l2cap_pi(sk)->flush_to;
c6b03cf9 1908 opts.mode = l2cap_pi(sk)->mode;
fcc203c3 1909 opts.fcs = l2cap_pi(sk)->fcs;
1da177e4
LT		 1910
1911 len = min_t(unsigned int, len, sizeof(opts));
1912 if (copy_to_user(optval, (char *) &opts, len))
1913 err = -EFAULT;
1914
1915 break;
1916
1917 case L2CAP_LM:
2af6b9d5
MH		 1918 switch (l2cap_pi(sk)->sec_level) {
1919 case BT_SECURITY_LOW:
1920 opt = L2CAP_LM_AUTH;
1921 break;
1922 case BT_SECURITY_MEDIUM:
1923 opt = L2CAP_LM_AUTH | L2CAP_LM_ENCRYPT;
1924 break;
1925 case BT_SECURITY_HIGH:
1926 opt = L2CAP_LM_AUTH | L2CAP_LM_ENCRYPT |
1927 L2CAP_LM_SECURE;
1928 break;
1929 default:
1930 opt = 0;
1931 break;
1932 }
1933
1934 if (l2cap_pi(sk)->role_switch)
1935 opt |= L2CAP_LM_MASTER;
1936
1937 if (l2cap_pi(sk)->force_reliable)
1938 opt |= L2CAP_LM_RELIABLE;
1939
1940 if (put_user(opt, (u32 __user *) optval))
1da177e4
LT		 1941 err = -EFAULT;
1942 break;
1943
1944 case L2CAP_CONNINFO:
f66dc81f
MH		 1945 if (sk->sk_state != BT_CONNECTED &&
1946 !(sk->sk_state == BT_CONNECT2 &&
1947 bt_sk(sk)->defer_setup)) {
1da177e4
LT		 1948 err = -ENOTCONN;
1949 break;
1950 }
1951
1952 cinfo.hci_handle = l2cap_pi(sk)->conn->hcon->handle;
1953 memcpy(cinfo.dev_class, l2cap_pi(sk)->conn->hcon->dev_class, 3);
1954
1955 len = min_t(unsigned int, len, sizeof(cinfo));
1956 if (copy_to_user(optval, (char *) &cinfo, len))
1957 err = -EFAULT;
1958
1959 break;
1960
1961 default:
1962 err = -ENOPROTOOPT;
1963 break;
1964 }
1965
1966 release_sock(sk);
1967 return err;
1968}
1969
d58daf42
MH		 1970static int l2cap_sock_getsockopt(struct socket *sock, int level, int optname, char __user *optval, int __user *optlen)
1971{
1972 struct sock *sk = sock->sk;
2af6b9d5 1973 struct bt_security sec;
d58daf42
MH		 1974 int len, err = 0;
1975
1976 BT_DBG("sk %p", sk);
1977
1978 if (level == SOL_L2CAP)
1979 return l2cap_sock_getsockopt_old(sock, optname, optval, optlen);
1980
0588d94f
MH		 1981 if (level != SOL_BLUETOOTH)
1982 return -ENOPROTOOPT;
1983
d58daf42
MH		 1984 if (get_user(len, optlen))
1985 return -EFAULT;
1986
1987 lock_sock(sk);
1988
1989 switch (optname) {
2af6b9d5 1990 case BT_SECURITY:
2526d3d8 1991 if (sk->sk_type != SOCK_SEQPACKET && sk->sk_type != SOCK_RAW) {
0588d94f
MH		 1992 err = -EINVAL;
1993 break;
1994 }
1995
2af6b9d5
MH		 1996 sec.level = l2cap_pi(sk)->sec_level;
1997
1998 len = min_t(unsigned int, len, sizeof(sec));
1999 if (copy_to_user(optval, (char *) &sec, len))
2000 err = -EFAULT;
2001
2002 break;
2003
f66dc81f
MH		 2004 case BT_DEFER_SETUP:
2005 if (sk->sk_state != BT_BOUND && sk->sk_state != BT_LISTEN) {
2006 err = -EINVAL;
2007 break;
2008 }
2009
2010 if (put_user(bt_sk(sk)->defer_setup, (u32 __user *) optval))
2011 err = -EFAULT;
2012
2013 break;
2014
d58daf42
MH		 2015 default:
2016 err = -ENOPROTOOPT;
2017 break;
2018 }
2019
2020 release_sock(sk);
2021 return err;
2022}
2023
1da177e4
LT		 2024static int l2cap_sock_shutdown(struct socket *sock, int how)
2025{
2026 struct sock *sk = sock->sk;
2027 int err = 0;
2028
2029 BT_DBG("sock %p, sk %p", sock, sk);
2030
2031 if (!sk)
2032 return 0;
2033
2034 lock_sock(sk);
2035 if (!sk->sk_shutdown) {
2036 sk->sk_shutdown = SHUTDOWN_MASK;
2037 l2cap_sock_clear_timer(sk);
2038 __l2cap_sock_close(sk, 0);
2039
2040 if (sock_flag(sk, SOCK_LINGER) && sk->sk_lingertime)
b1235d79
MH		 2041 err = bt_sock_wait_state(sk, BT_CLOSED,
2042 sk->sk_lingertime);
1da177e4
LT		 2043 }
2044 release_sock(sk);
2045 return err;
2046}
2047
2048static int l2cap_sock_release(struct socket *sock)
2049{
2050 struct sock *sk = sock->sk;
2051 int err;
2052
2053 BT_DBG("sock %p, sk %p", sock, sk);
2054
2055 if (!sk)
2056 return 0;
2057
2058 err = l2cap_sock_shutdown(sock, 2);
2059
2060 sock_orphan(sk);
2061 l2cap_sock_kill(sk);
2062 return err;
2063}
2064
1da177e4
LT		 2065static void l2cap_chan_ready(struct sock *sk)
2066{
2067 struct sock *parent = bt_sk(sk)->parent;
2068
2069 BT_DBG("sk %p, parent %p", sk, parent);
2070
2071 l2cap_pi(sk)->conf_state = 0;
2072 l2cap_sock_clear_timer(sk);
2073
2074 if (!parent) {
2075 /* Outgoing channel.
2076 * Wake up socket sleeping on connect.
2077 */
2078 sk->sk_state = BT_CONNECTED;
2079 sk->sk_state_change(sk);
2080 } else {
2081 /* Incoming channel.
2082 * Wake up socket sleeping on accept.
2083 */
2084 parent->sk_data_ready(parent, 0);
2085 }
2086}
2087
2088/* Copy frame to all raw sockets on that connection */
2089static void l2cap_raw_recv(struct l2cap_conn *conn, struct sk_buff *skb)
2090{
2091 struct l2cap_chan_list *l = &conn->chan_list;
2092 struct sk_buff *nskb;
af05b30b 2093 struct sock *sk;
1da177e4
LT		 2094
2095 BT_DBG("conn %p", conn);
2096
2097 read_lock(&l->lock);
2098 for (sk = l->head; sk; sk = l2cap_pi(sk)->next_c) {
2099 if (sk->sk_type != SOCK_RAW)
2100 continue;
2101
2102 /* Don't send frame to the socket it came from */
2103 if (skb->sk == sk)
2104 continue;
af05b30b
GP		 2105 nskb = skb_clone(skb, GFP_ATOMIC);
2106 if (!nskb)
1da177e4
LT		 2107 continue;
2108
2109 if (sock_queue_rcv_skb(sk, nskb))
2110 kfree_skb(nskb);
2111 }
2112 read_unlock(&l->lock);
2113}
2114
2115/* ---- L2CAP signalling commands ---- */
2116static struct sk_buff *l2cap_build_cmd(struct l2cap_conn *conn,
2117 u8 code, u8 ident, u16 dlen, void *data)
2118{
2119 struct sk_buff *skb, **frag;
2120 struct l2cap_cmd_hdr *cmd;
2121 struct l2cap_hdr *lh;
2122 int len, count;
2123
af05b30b
GP		 2124 BT_DBG("conn %p, code 0x%2.2x, ident 0x%2.2x, len %d",
2125 conn, code, ident, dlen);
1da177e4
LT		 2126
2127 len = L2CAP_HDR_SIZE + L2CAP_CMD_HDR_SIZE + dlen;
2128 count = min_t(unsigned int, conn->mtu, len);
2129
2130 skb = bt_skb_alloc(count, GFP_ATOMIC);
2131 if (!skb)
2132 return NULL;
2133
2134 lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE);
aca3192c 2135 lh->len = cpu_to_le16(L2CAP_CMD_HDR_SIZE + dlen);
8db4dc46 2136 lh->cid = cpu_to_le16(L2CAP_CID_SIGNALING);
1da177e4
LT		 2137
2138 cmd = (struct l2cap_cmd_hdr *) skb_put(skb, L2CAP_CMD_HDR_SIZE);
2139 cmd->code = code;
2140 cmd->ident = ident;
aca3192c 2141 cmd->len = cpu_to_le16(dlen);
1da177e4
LT		 2142
2143 if (dlen) {
2144 count -= L2CAP_HDR_SIZE + L2CAP_CMD_HDR_SIZE;
2145 memcpy(skb_put(skb, count), data, count);
2146 data += count;
2147 }
2148
2149 len -= skb->len;
2150
2151 /* Continuation fragments (no L2CAP header) */
2152 frag = &skb_shinfo(skb)->frag_list;
2153 while (len) {
2154 count = min_t(unsigned int, conn->mtu, len);
2155
2156 *frag = bt_skb_alloc(count, GFP_ATOMIC);
2157 if (!*frag)
2158 goto fail;
2159
2160 memcpy(skb_put(*frag, count), data, count);
2161
2162 len -= count;
2163 data += count;
2164
2165 frag = &(*frag)->next;
2166 }
2167
2168 return skb;
2169
2170fail:
2171 kfree_skb(skb);
2172 return NULL;
2173}
2174
2175static inline int l2cap_get_conf_opt(void **ptr, int *type, int *olen, unsigned long *val)
2176{
2177 struct l2cap_conf_opt *opt = *ptr;
2178 int len;
2179
2180 len = L2CAP_CONF_OPT_SIZE + opt->len;
2181 *ptr += len;
2182
2183 *type = opt->type;
2184 *olen = opt->len;
2185
2186 switch (opt->len) {
2187 case 1:
2188 *val = *((u8 *) opt->val);
2189 break;
2190
2191 case 2:
861d6882 2192 *val = __le16_to_cpu(*((__le16 *) opt->val));
1da177e4
LT		 2193 break;
2194
2195 case 4:
861d6882 2196 *val = __le32_to_cpu(*((__le32 *) opt->val));
1da177e4
LT		 2197 break;
2198
2199 default:
2200 *val = (unsigned long) opt->val;
2201 break;
2202 }
2203
2204 BT_DBG("type 0x%2.2x len %d val 0x%lx", *type, opt->len, *val);
2205 return len;
2206}
2207
1da177e4
LT		 2208static void l2cap_add_conf_opt(void **ptr, u8 type, u8 len, unsigned long val)
2209{
2210 struct l2cap_conf_opt *opt = *ptr;
2211
2212 BT_DBG("type 0x%2.2x len %d val 0x%lx", type, len, val);
2213
2214 opt->type = type;
2215 opt->len = len;
2216
2217 switch (len) {
2218 case 1:
2219 *((u8 *) opt->val) = val;
2220 break;
2221
2222 case 2:
8e036fc3 2223 *((__le16 *) opt->val) = cpu_to_le16(val);
1da177e4
LT		 2224 break;
2225
2226 case 4:
8e036fc3 2227 *((__le32 *) opt->val) = cpu_to_le32(val);
1da177e4
LT		 2228 break;
2229
2230 default:
2231 memcpy(opt->val, (void *) val, len);
2232 break;
2233 }
2234
2235 *ptr += L2CAP_CONF_OPT_SIZE + len;
2236}
2237
c1b4f43b
GP		 2238static void l2cap_ack_timeout(unsigned long arg)
2239{
2240 struct sock *sk = (void *) arg;
2241
2242 bh_lock_sock(sk);
2243 l2cap_send_ack(l2cap_pi(sk));
2244 bh_unlock_sock(sk);
2245}
2246
0565c1c2
GP		 2247static inline void l2cap_ertm_init(struct sock *sk)
2248{
2249 l2cap_pi(sk)->expected_ack_seq = 0;
2250 l2cap_pi(sk)->unacked_frames = 0;
2251 l2cap_pi(sk)->buffer_seq = 0;
2252 l2cap_pi(sk)->num_to_ack = 0;
d5392c8f 2253 l2cap_pi(sk)->frames_sent = 0;
0565c1c2
GP		 2254
2255 setup_timer(&l2cap_pi(sk)->retrans_timer,
2256 l2cap_retrans_timeout, (unsigned long) sk);
2257 setup_timer(&l2cap_pi(sk)->monitor_timer,
2258 l2cap_monitor_timeout, (unsigned long) sk);
c1b4f43b
GP		 2259 setup_timer(&l2cap_pi(sk)->ack_timer,
2260 l2cap_ack_timeout, (unsigned long) sk);
0565c1c2
GP		 2261
2262 __skb_queue_head_init(SREJ_QUEUE(sk));
2263}
2264
f2fcfcd6
GP		 2265static int l2cap_mode_supported(__u8 mode, __u32 feat_mask)
2266{
2267 u32 local_feat_mask = l2cap_feat_mask;
2268 if (enable_ertm)
6840ed07 2269 local_feat_mask |= L2CAP_FEAT_ERTM | L2CAP_FEAT_STREAMING;
f2fcfcd6
GP		 2270
2271 switch (mode) {
2272 case L2CAP_MODE_ERTM:
2273 return L2CAP_FEAT_ERTM & feat_mask & local_feat_mask;
2274 case L2CAP_MODE_STREAMING:
2275 return L2CAP_FEAT_STREAMING & feat_mask & local_feat_mask;
2276 default:
2277 return 0x00;
2278 }
2279}
2280
2281static inline __u8 l2cap_select_mode(__u8 mode, __u16 remote_feat_mask)
2282{
2283 switch (mode) {
2284 case L2CAP_MODE_STREAMING:
2285 case L2CAP_MODE_ERTM:
2286 if (l2cap_mode_supported(mode, remote_feat_mask))
2287 return mode;
2288 /* fall through */
2289 default:
2290 return L2CAP_MODE_BASIC;
2291 }
2292}
2293
1da177e4
LT		 2294static int l2cap_build_conf_req(struct sock *sk, void *data)
2295{
2296 struct l2cap_pinfo *pi = l2cap_pi(sk);
2297 struct l2cap_conf_req *req = data;
a0e55a32 2298 struct l2cap_conf_rfc rfc = { .mode = L2CAP_MODE_BASIC };
1da177e4
LT		 2299 void *ptr = req->data;
2300
2301 BT_DBG("sk %p", sk);
2302
f2fcfcd6
GP		 2303 if (pi->num_conf_req || pi->num_conf_rsp)
2304 goto done;
2305
2306 switch (pi->mode) {
2307 case L2CAP_MODE_STREAMING:
2308 case L2CAP_MODE_ERTM:
2309 pi->conf_state |= L2CAP_CONF_STATE2_DEVICE;
22121fc9
GP		 2310 if (!l2cap_mode_supported(pi->mode, pi->conn->feat_mask))
2311 l2cap_send_disconn_req(pi->conn, sk);
f2fcfcd6
GP		 2312 break;
2313 default:
2314 pi->mode = l2cap_select_mode(rfc.mode, pi->conn->feat_mask);
2315 break;
2316 }
2317
2318done:
65c7c491
MH		 2319 switch (pi->mode) {
2320 case L2CAP_MODE_BASIC:
2321 if (pi->imtu != L2CAP_DEFAULT_MTU)
2322 l2cap_add_conf_opt(&ptr, L2CAP_CONF_MTU, 2, pi->imtu);
2323 break;
2324
2325 case L2CAP_MODE_ERTM:
2326 rfc.mode = L2CAP_MODE_ERTM;
f2fcfcd6 2327 rfc.txwin_size = L2CAP_DEFAULT_TX_WINDOW;
5fbcd3d1 2328 rfc.max_transmit = max_transmit;
f2fcfcd6
GP		 2329 rfc.retrans_timeout = 0;
2330 rfc.monitor_timeout = 0;
c74e560c 2331 rfc.max_pdu_size = cpu_to_le16(L2CAP_DEFAULT_MAX_PDU_SIZE);
d1daa091
GP		 2332 if (L2CAP_DEFAULT_MAX_PDU_SIZE > pi->conn->mtu - 10)
2333 rfc.max_pdu_size = pi->conn->mtu - 10;
f2fcfcd6
GP		 2334
2335 l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC,
2336 sizeof(rfc), (unsigned long) &rfc);
fcc203c3
GP		 2337
2338 if (!(pi->conn->feat_mask & L2CAP_FEAT_FCS))
2339 break;
2340
2341 if (pi->fcs == L2CAP_FCS_NONE ||
2342 pi->conf_state & L2CAP_CONF_NO_FCS_RECV) {
2343 pi->fcs = L2CAP_FCS_NONE;
2344 l2cap_add_conf_opt(&ptr, L2CAP_CONF_FCS, 1, pi->fcs);
2345 }
f2fcfcd6
GP		 2346 break;
2347
2348 case L2CAP_MODE_STREAMING:
2349 rfc.mode = L2CAP_MODE_STREAMING;
2350 rfc.txwin_size = 0;
2351 rfc.max_transmit = 0;
2352 rfc.retrans_timeout = 0;
2353 rfc.monitor_timeout = 0;
c74e560c 2354 rfc.max_pdu_size = cpu_to_le16(L2CAP_DEFAULT_MAX_PDU_SIZE);
d1daa091
GP		 2355 if (L2CAP_DEFAULT_MAX_PDU_SIZE > pi->conn->mtu - 10)
2356 rfc.max_pdu_size = pi->conn->mtu - 10;
65c7c491
MH		 2357
2358 l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC,
2359 sizeof(rfc), (unsigned long) &rfc);
fcc203c3
GP		 2360
2361 if (!(pi->conn->feat_mask & L2CAP_FEAT_FCS))
2362 break;
2363
2364 if (pi->fcs == L2CAP_FCS_NONE ||
2365 pi->conf_state & L2CAP_CONF_NO_FCS_RECV) {
2366 pi->fcs = L2CAP_FCS_NONE;
2367 l2cap_add_conf_opt(&ptr, L2CAP_CONF_FCS, 1, pi->fcs);
2368 }
65c7c491
MH		 2369 break;
2370 }
1da177e4
LT		 2371
2372 /* FIXME: Need actual value of the flush timeout */
2373 //if (flush_to != L2CAP_DEFAULT_FLUSH_TO)
2374 // l2cap_add_conf_opt(&ptr, L2CAP_CONF_FLUSH_TO, 2, pi->flush_to);
2375
aca3192c
YH		 2376 req->dcid = cpu_to_le16(pi->dcid);
2377 req->flags = cpu_to_le16(0);
1da177e4
LT		 2378
2379 return ptr - data;
2380}
2381
5dee9e7c 2382static int l2cap_parse_conf_req(struct sock *sk, void *data)
1da177e4
LT		 2383{
2384 struct l2cap_pinfo *pi = l2cap_pi(sk);
5dee9e7c
MH		 2385 struct l2cap_conf_rsp *rsp = data;
2386 void *ptr = rsp->data;
2387 void *req = pi->conf_req;
2388 int len = pi->conf_len;
2389 int type, hint, olen;
2390 unsigned long val;
6464f35f 2391 struct l2cap_conf_rfc rfc = { .mode = L2CAP_MODE_BASIC };
861d6882 2392 u16 mtu = L2CAP_DEFAULT_MTU;
5dee9e7c 2393 u16 result = L2CAP_CONF_SUCCESS;
1da177e4 2394
5dee9e7c 2395 BT_DBG("sk %p", sk);
820ae1b8 2396
5dee9e7c
MH		 2397 while (len >= L2CAP_CONF_OPT_SIZE) {
2398 len -= l2cap_get_conf_opt(&req, &type, &olen, &val);
1da177e4 2399
589d2746 2400 hint = type & L2CAP_CONF_HINT;
47ec1dcd 2401 type &= L2CAP_CONF_MASK;
5dee9e7c
MH		 2402
2403 switch (type) {
2404 case L2CAP_CONF_MTU:
861d6882 2405 mtu = val;
5dee9e7c
MH		 2406 break;
2407
2408 case L2CAP_CONF_FLUSH_TO:
2409 pi->flush_to = val;
2410 break;
2411
2412 case L2CAP_CONF_QOS:
2413 break;
2414
6464f35f
MH		 2415 case L2CAP_CONF_RFC:
2416 if (olen == sizeof(rfc))
2417 memcpy(&rfc, (void *) val, olen);
2418 break;
2419
fcc203c3
GP		 2420 case L2CAP_CONF_FCS:
2421 if (val == L2CAP_FCS_NONE)
2422 pi->conf_state |= L2CAP_CONF_NO_FCS_RECV;
2423
2424 break;
2425
5dee9e7c
MH		 2426 default:
2427 if (hint)
2428 break;
2429
2430 result = L2CAP_CONF_UNKNOWN;
2431 *((u8 *) ptr++) = type;
2432 break;
2433 }
2434 }
2435
f2fcfcd6
GP		 2436 if (pi->num_conf_rsp || pi->num_conf_req)
2437 goto done;
2438
2439 switch (pi->mode) {
2440 case L2CAP_MODE_STREAMING:
2441 case L2CAP_MODE_ERTM:
2442 pi->conf_state |= L2CAP_CONF_STATE2_DEVICE;
2443 if (!l2cap_mode_supported(pi->mode, pi->conn->feat_mask))
2444 return -ECONNREFUSED;
2445 break;
2446 default:
2447 pi->mode = l2cap_select_mode(rfc.mode, pi->conn->feat_mask);
2448 break;
2449 }
2450
2451done:
2452 if (pi->mode != rfc.mode) {
2453 result = L2CAP_CONF_UNACCEPT;
2454 rfc.mode = pi->mode;
2455
2456 if (pi->num_conf_rsp == 1)
2457 return -ECONNREFUSED;
2458
2459 l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC,
2460 sizeof(rfc), (unsigned long) &rfc);
2461 }
2462
2463
5dee9e7c
MH		 2464 if (result == L2CAP_CONF_SUCCESS) {
2465 /* Configure output options and let the other side know
2466 * which ones we don't like. */
2467
f2fcfcd6
GP		 2468 if (mtu < L2CAP_DEFAULT_MIN_MTU)
2469 result = L2CAP_CONF_UNACCEPT;
2470 else {
2471 pi->omtu = mtu;
2472 pi->conf_state |= L2CAP_CONF_MTU_DONE;
2473 }
2474 l2cap_add_conf_opt(&ptr, L2CAP_CONF_MTU, 2, pi->omtu);
6464f35f 2475
f2fcfcd6
GP		 2476 switch (rfc.mode) {
2477 case L2CAP_MODE_BASIC:
2478 pi->fcs = L2CAP_FCS_NONE;
2479 pi->conf_state |= L2CAP_CONF_MODE_DONE;
2480 break;
2481
2482 case L2CAP_MODE_ERTM:
2483 pi->remote_tx_win = rfc.txwin_size;
2484 pi->remote_max_tx = rfc.max_transmit;
2485 pi->max_pdu_size = rfc.max_pdu_size;
2486
2487 rfc.retrans_timeout = L2CAP_DEFAULT_RETRANS_TO;
2488 rfc.monitor_timeout = L2CAP_DEFAULT_MONITOR_TO;
2489
2490 pi->conf_state |= L2CAP_CONF_MODE_DONE;
68ae6639
GP		 2491
2492 l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC,
2493 sizeof(rfc), (unsigned long) &rfc);
2494
f2fcfcd6
GP		 2495 break;
2496
2497 case L2CAP_MODE_STREAMING:
f2fcfcd6
GP		 2498 pi->max_pdu_size = rfc.max_pdu_size;
2499
2500 pi->conf_state |= L2CAP_CONF_MODE_DONE;
68ae6639
GP		 2501
2502 l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC,
2503 sizeof(rfc), (unsigned long) &rfc);
2504
f2fcfcd6
GP		 2505 break;
2506
2507 default:
5dee9e7c 2508 result = L2CAP_CONF_UNACCEPT;
5dee9e7c 2509
6464f35f 2510 memset(&rfc, 0, sizeof(rfc));
f2fcfcd6
GP		 2511 rfc.mode = pi->mode;
2512 }
6464f35f 2513
f2fcfcd6
GP		 2514 if (result == L2CAP_CONF_SUCCESS)
2515 pi->conf_state |= L2CAP_CONF_OUTPUT_DONE;
2516 }
5dee9e7c
MH		 2517 rsp->scid = cpu_to_le16(pi->dcid);
2518 rsp->result = cpu_to_le16(result);
2519 rsp->flags = cpu_to_le16(0x0000);
2520
2521 return ptr - data;
1da177e4
LT		 2522}
2523
f2fcfcd6
GP		 2524static int l2cap_parse_conf_rsp(struct sock *sk, void *rsp, int len, void *data, u16 *result)
2525{
2526 struct l2cap_pinfo *pi = l2cap_pi(sk);
2527 struct l2cap_conf_req *req = data;
2528 void *ptr = req->data;
2529 int type, olen;
2530 unsigned long val;
2531 struct l2cap_conf_rfc rfc;
2532
2533 BT_DBG("sk %p, rsp %p, len %d, req %p", sk, rsp, len, data);
2534
2535 while (len >= L2CAP_CONF_OPT_SIZE) {
2536 len -= l2cap_get_conf_opt(&rsp, &type, &olen, &val);
2537
2538 switch (type) {
2539 case L2CAP_CONF_MTU:
2540 if (val < L2CAP_DEFAULT_MIN_MTU) {
2541 *result = L2CAP_CONF_UNACCEPT;
2542 pi->omtu = L2CAP_DEFAULT_MIN_MTU;
2543 } else
2544 pi->omtu = val;
2545 l2cap_add_conf_opt(&ptr, L2CAP_CONF_MTU, 2, pi->omtu);
2546 break;
2547
2548 case L2CAP_CONF_FLUSH_TO:
2549 pi->flush_to = val;
2550 l2cap_add_conf_opt(&ptr, L2CAP_CONF_FLUSH_TO,
2551 2, pi->flush_to);
2552 break;
2553
2554 case L2CAP_CONF_RFC:
2555 if (olen == sizeof(rfc))
2556 memcpy(&rfc, (void *)val, olen);
2557
2558 if ((pi->conf_state & L2CAP_CONF_STATE2_DEVICE) &&
2559 rfc.mode != pi->mode)
2560 return -ECONNREFUSED;
2561
2562 pi->mode = rfc.mode;
2563 pi->fcs = 0;
2564
2565 l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC,
2566 sizeof(rfc), (unsigned long) &rfc);
2567 break;
2568 }
2569 }
2570
2571 if (*result == L2CAP_CONF_SUCCESS) {
2572 switch (rfc.mode) {
2573 case L2CAP_MODE_ERTM:
2574 pi->remote_tx_win = rfc.txwin_size;
2575 pi->retrans_timeout = rfc.retrans_timeout;
2576 pi->monitor_timeout = rfc.monitor_timeout;
2577 pi->max_pdu_size = le16_to_cpu(rfc.max_pdu_size);
2578 break;
2579 case L2CAP_MODE_STREAMING:
2580 pi->max_pdu_size = le16_to_cpu(rfc.max_pdu_size);
2581 break;
2582 }
2583 }
2584
2585 req->dcid = cpu_to_le16(pi->dcid);
2586 req->flags = cpu_to_le16(0x0000);
2587
2588 return ptr - data;
2589}
2590
5dee9e7c 2591static int l2cap_build_conf_rsp(struct sock *sk, void *data, u16 result, u16 flags)
1da177e4
LT		 2592{
2593 struct l2cap_conf_rsp *rsp = data;
2594 void *ptr = rsp->data;
1da177e4 2595
5dee9e7c 2596 BT_DBG("sk %p", sk);
1da177e4 2597
aca3192c 2598 rsp->scid = cpu_to_le16(l2cap_pi(sk)->dcid);
5dee9e7c 2599 rsp->result = cpu_to_le16(result);
aca3192c 2600 rsp->flags = cpu_to_le16(flags);
1da177e4
LT		 2601
2602 return ptr - data;
2603}
2604
7b1c0049
GP		 2605static void l2cap_conf_rfc_get(struct sock *sk, void *rsp, int len)
2606{
2607 struct l2cap_pinfo *pi = l2cap_pi(sk);
2608 int type, olen;
2609 unsigned long val;
2610 struct l2cap_conf_rfc rfc;
2611
2612 BT_DBG("sk %p, rsp %p, len %d", sk, rsp, len);
2613
2614 if ((pi->mode != L2CAP_MODE_ERTM) && (pi->mode != L2CAP_MODE_STREAMING))
2615 return;
2616
2617 while (len >= L2CAP_CONF_OPT_SIZE) {
2618 len -= l2cap_get_conf_opt(&rsp, &type, &olen, &val);
2619
2620 switch (type) {
2621 case L2CAP_CONF_RFC:
2622 if (olen == sizeof(rfc))
2623 memcpy(&rfc, (void *)val, olen);
2624 goto done;
2625 }
2626 }
2627
2628done:
2629 switch (rfc.mode) {
2630 case L2CAP_MODE_ERTM:
2631 pi->remote_tx_win = rfc.txwin_size;
2632 pi->retrans_timeout = rfc.retrans_timeout;
2633 pi->monitor_timeout = rfc.monitor_timeout;
2634 pi->mps = le16_to_cpu(rfc.max_pdu_size);
2635 break;
2636 case L2CAP_MODE_STREAMING:
2637 pi->mps = le16_to_cpu(rfc.max_pdu_size);
2638 }
2639}
2640
4e8402a3
MH		 2641static inline int l2cap_command_rej(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data)
2642{
2643 struct l2cap_cmd_rej *rej = (struct l2cap_cmd_rej *) data;
2644
2645 if (rej->reason != 0x0000)
2646 return 0;
2647
2648 if ((conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_SENT) &&
2649 cmd->ident == conn->info_ident) {
4e8402a3 2650 del_timer(&conn->info_timer);
984947dc
MH		 2651
2652 conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE;
e1027a7c 2653 conn->info_ident = 0;
984947dc 2654
4e8402a3
MH		 2655 l2cap_conn_start(conn);
2656 }
2657
2658 return 0;
2659}
2660
1da177e4
LT		 2661static inline int l2cap_connect_req(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data)
2662{
2663 struct l2cap_chan_list *list = &conn->chan_list;
2664 struct l2cap_conn_req *req = (struct l2cap_conn_req *) data;
2665 struct l2cap_conn_rsp rsp;
2666 struct sock *sk, *parent;
e7c29cb1 2667 int result, status = L2CAP_CS_NO_INFO;
1da177e4
LT		 2668
2669 u16 dcid = 0, scid = __le16_to_cpu(req->scid);
e7c29cb1 2670 __le16 psm = req->psm;
1da177e4
LT		 2671
2672 BT_DBG("psm 0x%2.2x scid 0x%4.4x", psm, scid);
2673
2674 /* Check if we have socket listening on psm */
2675 parent = l2cap_get_sock_by_psm(BT_LISTEN, psm, conn->src);
2676 if (!parent) {
2677 result = L2CAP_CR_BAD_PSM;
2678 goto sendresp;
2679 }
2680
e7c29cb1
MH		 2681 /* Check if the ACL is secure enough (if not SDP) */
2682 if (psm != cpu_to_le16(0x0001) &&
2683 !hci_conn_check_link_mode(conn->hcon)) {
2950f21a 2684 conn->disc_reason = 0x05;
e7c29cb1
MH		 2685 result = L2CAP_CR_SEC_BLOCK;
2686 goto response;
2687 }
2688
1da177e4
LT		 2689 result = L2CAP_CR_NO_MEM;
2690
2691 /* Check for backlog size */
2692 if (sk_acceptq_is_full(parent)) {
8e87d142 2693 BT_DBG("backlog full %d", parent->sk_ack_backlog);
1da177e4
LT		 2694 goto response;
2695 }
2696
3b1e0a65 2697 sk = l2cap_sock_alloc(sock_net(parent), NULL, BTPROTO_L2CAP, GFP_ATOMIC);
1da177e4
LT		 2698 if (!sk)
2699 goto response;
2700
fd1278d7 2701 write_lock_bh(&list->lock);
1da177e4
LT		 2702
2703 /* Check if we already have channel with that dcid */
2704 if (__l2cap_get_chan_by_dcid(list, scid)) {
fd1278d7 2705 write_unlock_bh(&list->lock);
1da177e4
LT		 2706 sock_set_flag(sk, SOCK_ZAPPED);
2707 l2cap_sock_kill(sk);
2708 goto response;
2709 }
2710
2711 hci_conn_hold(conn->hcon);
2712
2713 l2cap_sock_init(sk, parent);
2714 bacpy(&bt_sk(sk)->src, conn->src);
2715 bacpy(&bt_sk(sk)->dst, conn->dst);
2716 l2cap_pi(sk)->psm = psm;
2717 l2cap_pi(sk)->dcid = scid;
2718
2719 __l2cap_chan_add(conn, sk, parent);
2720 dcid = l2cap_pi(sk)->scid;
2721
2722 l2cap_sock_set_timer(sk, sk->sk_sndtimeo);
2723
1da177e4
LT		 2724 l2cap_pi(sk)->ident = cmd->ident;
2725
984947dc 2726 if (conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_DONE) {
2af6b9d5 2727 if (l2cap_check_security(sk)) {
f66dc81f
MH		 2728 if (bt_sk(sk)->defer_setup) {
2729 sk->sk_state = BT_CONNECT2;
2730 result = L2CAP_CR_PEND;
2731 status = L2CAP_CS_AUTHOR_PEND;
2732 parent->sk_data_ready(parent, 0);
2733 } else {
2734 sk->sk_state = BT_CONFIG;
2735 result = L2CAP_CR_SUCCESS;
2736 status = L2CAP_CS_NO_INFO;
2737 }
79d554a6
MH		 2738 } else {
2739 sk->sk_state = BT_CONNECT2;
2740 result = L2CAP_CR_PEND;
2741 status = L2CAP_CS_AUTHEN_PEND;
2742 }
2743 } else {
2744 sk->sk_state = BT_CONNECT2;
2745 result = L2CAP_CR_PEND;
2746 status = L2CAP_CS_NO_INFO;
1da177e4
LT		 2747 }
2748
fd1278d7 2749 write_unlock_bh(&list->lock);
1da177e4
LT		 2750
2751response:
2752 bh_unlock_sock(parent);
2753
2754sendresp:
aca3192c
YH		 2755 rsp.scid = cpu_to_le16(scid);
2756 rsp.dcid = cpu_to_le16(dcid);
2757 rsp.result = cpu_to_le16(result);
2758 rsp.status = cpu_to_le16(status);
1da177e4 2759 l2cap_send_cmd(conn, cmd->ident, L2CAP_CONN_RSP, sizeof(rsp), &rsp);
79d554a6
MH		 2760
2761 if (result == L2CAP_CR_PEND && status == L2CAP_CS_NO_INFO) {
2762 struct l2cap_info_req info;
2763 info.type = cpu_to_le16(L2CAP_IT_FEAT_MASK);
2764
2765 conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_SENT;
2766 conn->info_ident = l2cap_get_ident(conn);
2767
2768 mod_timer(&conn->info_timer, jiffies +
2769 msecs_to_jiffies(L2CAP_INFO_TIMEOUT));
2770
2771 l2cap_send_cmd(conn, conn->info_ident,
2772 L2CAP_INFO_REQ, sizeof(info), &info);
2773 }
2774
1da177e4
LT		 2775 return 0;
2776}
2777
2778static inline int l2cap_connect_rsp(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data)
2779{
2780 struct l2cap_conn_rsp *rsp = (struct l2cap_conn_rsp *) data;
2781 u16 scid, dcid, result, status;
2782 struct sock *sk;
2783 u8 req[128];
2784
2785 scid = __le16_to_cpu(rsp->scid);
2786 dcid = __le16_to_cpu(rsp->dcid);
2787 result = __le16_to_cpu(rsp->result);
2788 status = __le16_to_cpu(rsp->status);
2789
2790 BT_DBG("dcid 0x%4.4x scid 0x%4.4x result 0x%2.2x status 0x%2.2x", dcid, scid, result, status);
2791
2792 if (scid) {
af05b30b
GP		 2793 sk = l2cap_get_chan_by_scid(&conn->chan_list, scid);
2794 if (!sk)
1da177e4
LT		 2795 return 0;
2796 } else {
af05b30b
GP		 2797 sk = l2cap_get_chan_by_ident(&conn->chan_list, cmd->ident);
2798 if (!sk)
1da177e4
LT		 2799 return 0;
2800 }
2801
2802 switch (result) {
2803 case L2CAP_CR_SUCCESS:
2804 sk->sk_state = BT_CONFIG;
2805 l2cap_pi(sk)->ident = 0;
2806 l2cap_pi(sk)->dcid = dcid;
2807 l2cap_pi(sk)->conf_state |= L2CAP_CONF_REQ_SENT;
2808
6a8d3010
MH		 2809 l2cap_pi(sk)->conf_state &= ~L2CAP_CONF_CONNECT_PEND;
2810
1da177e4
LT		 2811 l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ,
2812 l2cap_build_conf_req(sk, req), req);
f2fcfcd6 2813 l2cap_pi(sk)->num_conf_req++;
1da177e4
LT		 2814 break;
2815
2816 case L2CAP_CR_PEND:
6a8d3010 2817 l2cap_pi(sk)->conf_state |= L2CAP_CONF_CONNECT_PEND;
1da177e4
LT		 2818 break;
2819
2820 default:
2821 l2cap_chan_del(sk, ECONNREFUSED);
2822 break;
2823 }
2824
2825 bh_unlock_sock(sk);
2826 return 0;
2827}
2828
88219a0f 2829static inline int l2cap_config_req(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u16 cmd_len, u8 *data)
1da177e4
LT		 2830{
2831 struct l2cap_conf_req *req = (struct l2cap_conf_req *) data;
2832 u16 dcid, flags;
2833 u8 rsp[64];
2834 struct sock *sk;
5dee9e7c 2835 int len;
1da177e4
LT		 2836
2837 dcid = __le16_to_cpu(req->dcid);
2838 flags = __le16_to_cpu(req->flags);
2839
2840 BT_DBG("dcid 0x%4.4x flags 0x%2.2x", dcid, flags);
2841
af05b30b
GP		 2842 sk = l2cap_get_chan_by_scid(&conn->chan_list, dcid);
2843 if (!sk)
1da177e4
LT		 2844 return -ENOENT;
2845
354f60a9
MH		 2846 if (sk->sk_state == BT_DISCONN)
2847 goto unlock;
2848
5dee9e7c 2849 /* Reject if config buffer is too small. */
88219a0f 2850 len = cmd_len - sizeof(*req);
5dee9e7c
MH		 2851 if (l2cap_pi(sk)->conf_len + len > sizeof(l2cap_pi(sk)->conf_req)) {
2852 l2cap_send_cmd(conn, cmd->ident, L2CAP_CONF_RSP,
2853 l2cap_build_conf_rsp(sk, rsp,
2854 L2CAP_CONF_REJECT, flags), rsp);
2855 goto unlock;
2856 }
2857
2858 /* Store config. */
2859 memcpy(l2cap_pi(sk)->conf_req + l2cap_pi(sk)->conf_len, req->data, len);
2860 l2cap_pi(sk)->conf_len += len;
1da177e4
LT		 2861
2862 if (flags & 0x0001) {
2863 /* Incomplete config. Send empty response. */
2864 l2cap_send_cmd(conn, cmd->ident, L2CAP_CONF_RSP,
5dee9e7c
MH		 2865 l2cap_build_conf_rsp(sk, rsp,
2866 L2CAP_CONF_SUCCESS, 0x0001), rsp);
1da177e4
LT		 2867 goto unlock;
2868 }
2869
2870 /* Complete config. */
5dee9e7c 2871 len = l2cap_parse_conf_req(sk, rsp);
f2fcfcd6 2872 if (len < 0) {
22121fc9 2873 l2cap_send_disconn_req(conn, sk);
1da177e4 2874 goto unlock;
f2fcfcd6 2875 }
1da177e4 2876
5dee9e7c 2877 l2cap_send_cmd(conn, cmd->ident, L2CAP_CONF_RSP, len, rsp);
f2fcfcd6 2878 l2cap_pi(sk)->num_conf_rsp++;
5dee9e7c 2879
5dee9e7c
MH		 2880 /* Reset config buffer. */
2881 l2cap_pi(sk)->conf_len = 0;
2882
876d9484
MH		 2883 if (!(l2cap_pi(sk)->conf_state & L2CAP_CONF_OUTPUT_DONE))
2884 goto unlock;
2885
1da177e4 2886 if (l2cap_pi(sk)->conf_state & L2CAP_CONF_INPUT_DONE) {
f64f9e71
JP		 2887 if (!(l2cap_pi(sk)->conf_state & L2CAP_CONF_NO_FCS_RECV) ||
2888 l2cap_pi(sk)->fcs != L2CAP_FCS_NONE)
fcc203c3
GP		 2889 l2cap_pi(sk)->fcs = L2CAP_FCS_CRC16;
2890
1da177e4 2891 sk->sk_state = BT_CONNECTED;
e90bac06 2892
0565c1c2
GP		 2893 l2cap_pi(sk)->next_tx_seq = 0;
2894 l2cap_pi(sk)->expected_tx_seq = 0;
1c2acffb 2895 __skb_queue_head_init(TX_QUEUE(sk));
0565c1c2
GP		 2896 if (l2cap_pi(sk)->mode == L2CAP_MODE_ERTM)
2897 l2cap_ertm_init(sk);
2898
1da177e4 2899 l2cap_chan_ready(sk);
876d9484
MH		 2900 goto unlock;
2901 }
2902
2903 if (!(l2cap_pi(sk)->conf_state & L2CAP_CONF_REQ_SENT)) {
79d554a6 2904 u8 buf[64];
1da177e4 2905 l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ,
79d554a6 2906 l2cap_build_conf_req(sk, buf), buf);
f2fcfcd6 2907 l2cap_pi(sk)->num_conf_req++;
1da177e4
LT		 2908 }
2909
2910unlock:
2911 bh_unlock_sock(sk);
2912 return 0;
2913}
2914
2915static inline int l2cap_config_rsp(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data)
2916{
2917 struct l2cap_conf_rsp *rsp = (struct l2cap_conf_rsp *)data;
2918 u16 scid, flags, result;
2919 struct sock *sk;
7b1c0049 2920 int len = cmd->len - sizeof(*rsp);
1da177e4
LT		 2921
2922 scid = __le16_to_cpu(rsp->scid);
2923 flags = __le16_to_cpu(rsp->flags);
2924 result = __le16_to_cpu(rsp->result);
2925
af05b30b
GP		 2926 BT_DBG("scid 0x%4.4x flags 0x%2.2x result 0x%2.2x",
2927 scid, flags, result);
1da177e4 2928
af05b30b
GP		 2929 sk = l2cap_get_chan_by_scid(&conn->chan_list, scid);
2930 if (!sk)
1da177e4
LT		 2931 return 0;
2932
2933 switch (result) {
2934 case L2CAP_CONF_SUCCESS:
7b1c0049 2935 l2cap_conf_rfc_get(sk, rsp->data, len);
1da177e4
LT		 2936 break;
2937
2938 case L2CAP_CONF_UNACCEPT:
f2fcfcd6 2939 if (l2cap_pi(sk)->num_conf_rsp <= L2CAP_CONF_MAX_CONF_RSP) {
f2fcfcd6
GP		 2940 char req[64];
2941
c2c77ec8
AE		 2942 if (len > sizeof(req) - sizeof(struct l2cap_conf_req)) {
2943 l2cap_send_disconn_req(conn, sk);
2944 goto done;
2945 }
2946
f2fcfcd6
GP		 2947 /* throw out any old stored conf requests */
2948 result = L2CAP_CONF_SUCCESS;
2949 len = l2cap_parse_conf_rsp(sk, rsp->data,
2950 len, req, &result);
2951 if (len < 0) {
22121fc9 2952 l2cap_send_disconn_req(conn, sk);
f2fcfcd6
GP		 2953 goto done;
2954 }
2955
2956 l2cap_send_cmd(conn, l2cap_get_ident(conn),
2957 L2CAP_CONF_REQ, len, req);
2958 l2cap_pi(sk)->num_conf_req++;
2959 if (result != L2CAP_CONF_SUCCESS)
2960 goto done;
2961 break;
1da177e4
LT		 2962 }
2963
8e87d142 2964 default:
1da177e4 2965 sk->sk_state = BT_DISCONN;
b1235d79 2966 sk->sk_err = ECONNRESET;
1da177e4 2967 l2cap_sock_set_timer(sk, HZ * 5);
22121fc9 2968 l2cap_send_disconn_req(conn, sk);
1da177e4
LT		 2969 goto done;
2970 }
2971
2972 if (flags & 0x01)
2973 goto done;
2974
1da177e4
LT		 2975 l2cap_pi(sk)->conf_state |= L2CAP_CONF_INPUT_DONE;
2976
2977 if (l2cap_pi(sk)->conf_state & L2CAP_CONF_OUTPUT_DONE) {
f64f9e71
JP		 2978 if (!(l2cap_pi(sk)->conf_state & L2CAP_CONF_NO_FCS_RECV) ||
2979 l2cap_pi(sk)->fcs != L2CAP_FCS_NONE)
fcc203c3
GP		 2980 l2cap_pi(sk)->fcs = L2CAP_FCS_CRC16;
2981
1da177e4 2982 sk->sk_state = BT_CONNECTED;
0565c1c2 2983 l2cap_pi(sk)->next_tx_seq = 0;
1c2acffb 2984 l2cap_pi(sk)->expected_tx_seq = 0;
1c2acffb 2985 __skb_queue_head_init(TX_QUEUE(sk));
0565c1c2
GP		 2986 if (l2cap_pi(sk)->mode == L2CAP_MODE_ERTM)
2987 l2cap_ertm_init(sk);
2988
1da177e4
LT		 2989 l2cap_chan_ready(sk);
2990 }
2991
2992done:
2993 bh_unlock_sock(sk);
2994 return 0;
2995}
2996
2997static inline int l2cap_disconnect_req(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data)
2998{
2999 struct l2cap_disconn_req *req = (struct l2cap_disconn_req *) data;
3000 struct l2cap_disconn_rsp rsp;
3001 u16 dcid, scid;
3002 struct sock *sk;
3003
3004 scid = __le16_to_cpu(req->scid);
3005 dcid = __le16_to_cpu(req->dcid);
3006
3007 BT_DBG("scid 0x%4.4x dcid 0x%4.4x", scid, dcid);
3008
af05b30b
GP		 3009 sk = l2cap_get_chan_by_scid(&conn->chan_list, dcid);
3010 if (!sk)
1da177e4
LT		 3011 return 0;
3012
aca3192c
YH		 3013 rsp.dcid = cpu_to_le16(l2cap_pi(sk)->scid);
3014 rsp.scid = cpu_to_le16(l2cap_pi(sk)->dcid);
1da177e4
LT		 3015 l2cap_send_cmd(conn, cmd->ident, L2CAP_DISCONN_RSP, sizeof(rsp), &rsp);
3016
3017 sk->sk_shutdown = SHUTDOWN_MASK;
3018
1c2acffb 3019 skb_queue_purge(TX_QUEUE(sk));
0565c1c2
GP		 3020
3021 if (l2cap_pi(sk)->mode == L2CAP_MODE_ERTM) {
3022 skb_queue_purge(SREJ_QUEUE(sk));
3023 del_timer(&l2cap_pi(sk)->retrans_timer);
3024 del_timer(&l2cap_pi(sk)->monitor_timer);
c1b4f43b 3025 del_timer(&l2cap_pi(sk)->ack_timer);
0565c1c2 3026 }
1c2acffb 3027
1da177e4
LT		 3028 l2cap_chan_del(sk, ECONNRESET);
3029 bh_unlock_sock(sk);
3030
3031 l2cap_sock_kill(sk);
3032 return 0;
3033}
3034
3035static inline int l2cap_disconnect_rsp(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data)
3036{
3037 struct l2cap_disconn_rsp *rsp = (struct l2cap_disconn_rsp *) data;
3038 u16 dcid, scid;
3039 struct sock *sk;
3040
3041 scid = __le16_to_cpu(rsp->scid);
3042 dcid = __le16_to_cpu(rsp->dcid);
3043
3044 BT_DBG("dcid 0x%4.4x scid 0x%4.4x", dcid, scid);
3045
af05b30b
GP		 3046 sk = l2cap_get_chan_by_scid(&conn->chan_list, scid);
3047 if (!sk)
1da177e4
LT		 3048 return 0;
3049
1c2acffb 3050 skb_queue_purge(TX_QUEUE(sk));
0565c1c2
GP		 3051
3052 if (l2cap_pi(sk)->mode == L2CAP_MODE_ERTM) {
3053 skb_queue_purge(SREJ_QUEUE(sk));
3054 del_timer(&l2cap_pi(sk)->retrans_timer);
3055 del_timer(&l2cap_pi(sk)->monitor_timer);
c1b4f43b 3056 del_timer(&l2cap_pi(sk)->ack_timer);
0565c1c2 3057 }
1c2acffb 3058
1da177e4
LT		 3059 l2cap_chan_del(sk, 0);
3060 bh_unlock_sock(sk);
3061
3062 l2cap_sock_kill(sk);
3063 return 0;
3064}
3065
3066static inline int l2cap_information_req(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data)
3067{
3068 struct l2cap_info_req *req = (struct l2cap_info_req *) data;
1da177e4
LT		 3069 u16 type;
3070
3071 type = __le16_to_cpu(req->type);
3072
3073 BT_DBG("type 0x%4.4x", type);
3074
f0709e03
MH		 3075 if (type == L2CAP_IT_FEAT_MASK) {
3076 u8 buf[8];
44dd46de 3077 u32 feat_mask = l2cap_feat_mask;
f0709e03
MH		 3078 struct l2cap_info_rsp *rsp = (struct l2cap_info_rsp *) buf;
3079 rsp->type = cpu_to_le16(L2CAP_IT_FEAT_MASK);
3080 rsp->result = cpu_to_le16(L2CAP_IR_SUCCESS);
44dd46de 3081 if (enable_ertm)
fcc203c3
GP		 3082 feat_mask |= L2CAP_FEAT_ERTM | L2CAP_FEAT_STREAMING
3083 | L2CAP_FEAT_FCS;
1b7bf4ed 3084 put_unaligned_le32(feat_mask, rsp->data);
f0709e03
MH		 3085 l2cap_send_cmd(conn, cmd->ident,
3086 L2CAP_INFO_RSP, sizeof(buf), buf);
e1027a7c
MH		 3087 } else if (type == L2CAP_IT_FIXED_CHAN) {
3088 u8 buf[12];
3089 struct l2cap_info_rsp *rsp = (struct l2cap_info_rsp *) buf;
3090 rsp->type = cpu_to_le16(L2CAP_IT_FIXED_CHAN);
3091 rsp->result = cpu_to_le16(L2CAP_IR_SUCCESS);
3092 memcpy(buf + 4, l2cap_fixed_chan, 8);
3093 l2cap_send_cmd(conn, cmd->ident,
3094 L2CAP_INFO_RSP, sizeof(buf), buf);
f0709e03
MH		 3095 } else {
3096 struct l2cap_info_rsp rsp;
3097 rsp.type = cpu_to_le16(type);
3098 rsp.result = cpu_to_le16(L2CAP_IR_NOTSUPP);
3099 l2cap_send_cmd(conn, cmd->ident,
3100 L2CAP_INFO_RSP, sizeof(rsp), &rsp);
3101 }
1da177e4
LT		 3102
3103 return 0;
3104}
3105
3106static inline int l2cap_information_rsp(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data)
3107{
3108 struct l2cap_info_rsp *rsp = (struct l2cap_info_rsp *) data;
3109 u16 type, result;
3110
3111 type = __le16_to_cpu(rsp->type);
3112 result = __le16_to_cpu(rsp->result);
3113
3114 BT_DBG("type 0x%4.4x result 0x%2.2x", type, result);
3115
4e8402a3
MH		 3116 del_timer(&conn->info_timer);
3117
984947dc 3118 if (type == L2CAP_IT_FEAT_MASK) {
83985319 3119 conn->feat_mask = get_unaligned_le32(rsp->data);
4e8402a3 3120
47ec1dcd 3121 if (conn->feat_mask & L2CAP_FEAT_FIXED_CHAN) {
e1027a7c
MH		 3122 struct l2cap_info_req req;
3123 req.type = cpu_to_le16(L2CAP_IT_FIXED_CHAN);
3124
3125 conn->info_ident = l2cap_get_ident(conn);
3126
3127 l2cap_send_cmd(conn, conn->info_ident,
3128 L2CAP_INFO_REQ, sizeof(req), &req);
3129 } else {
3130 conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE;
3131 conn->info_ident = 0;
3132
3133 l2cap_conn_start(conn);
3134 }
3135 } else if (type == L2CAP_IT_FIXED_CHAN) {
984947dc 3136 conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE;
e1027a7c 3137 conn->info_ident = 0;
984947dc
MH		 3138
3139 l2cap_conn_start(conn);
3140 }
4e8402a3 3141
1da177e4
LT		 3142 return 0;
3143}
3144
3145static inline void l2cap_sig_channel(struct l2cap_conn *conn, struct sk_buff *skb)
3146{
3147 u8 *data = skb->data;
3148 int len = skb->len;
3149 struct l2cap_cmd_hdr cmd;
3150 int err = 0;
3151
3152 l2cap_raw_recv(conn, skb);
3153
3154 while (len >= L2CAP_CMD_HDR_SIZE) {
88219a0f 3155 u16 cmd_len;
1da177e4
LT		 3156 memcpy(&cmd, data, L2CAP_CMD_HDR_SIZE);
3157 data += L2CAP_CMD_HDR_SIZE;
3158 len -= L2CAP_CMD_HDR_SIZE;
3159
88219a0f 3160 cmd_len = le16_to_cpu(cmd.len);
1da177e4 3161
88219a0f 3162 BT_DBG("code 0x%2.2x len %d id 0x%2.2x", cmd.code, cmd_len, cmd.ident);
1da177e4 3163
88219a0f 3164 if (cmd_len > len || !cmd.ident) {
1da177e4
LT		 3165 BT_DBG("corrupted command");
3166 break;
3167 }
3168
3169 switch (cmd.code) {
3170 case L2CAP_COMMAND_REJ:
4e8402a3 3171 l2cap_command_rej(conn, &cmd, data);
1da177e4
LT		 3172 break;
3173
3174 case L2CAP_CONN_REQ:
3175 err = l2cap_connect_req(conn, &cmd, data);
3176 break;
3177
3178 case L2CAP_CONN_RSP:
3179 err = l2cap_connect_rsp(conn, &cmd, data);
3180 break;
3181
3182 case L2CAP_CONF_REQ:
88219a0f 3183 err = l2cap_config_req(conn, &cmd, cmd_len, data);
1da177e4
LT		 3184 break;
3185
3186 case L2CAP_CONF_RSP:
3187 err = l2cap_config_rsp(conn, &cmd, data);
3188 break;
3189
3190 case L2CAP_DISCONN_REQ:
3191 err = l2cap_disconnect_req(conn, &cmd, data);
3192 break;
3193
3194 case L2CAP_DISCONN_RSP:
3195 err = l2cap_disconnect_rsp(conn, &cmd, data);
3196 break;
3197
3198 case L2CAP_ECHO_REQ:
88219a0f 3199 l2cap_send_cmd(conn, cmd.ident, L2CAP_ECHO_RSP, cmd_len, data);
1da177e4
LT		 3200 break;
3201
3202 case L2CAP_ECHO_RSP:
3203 break;
3204
3205 case L2CAP_INFO_REQ:
3206 err = l2cap_information_req(conn, &cmd, data);
3207 break;
3208
3209 case L2CAP_INFO_RSP:
3210 err = l2cap_information_rsp(conn, &cmd, data);
3211 break;
3212
3213 default:
3214 BT_ERR("Unknown signaling command 0x%2.2x", cmd.code);
3215 err = -EINVAL;
3216 break;
3217 }
3218
3219 if (err) {
3220 struct l2cap_cmd_rej rej;
3221 BT_DBG("error %d", err);
3222
3223 /* FIXME: Map err to a valid reason */
aca3192c 3224 rej.reason = cpu_to_le16(0);
1da177e4
LT		 3225 l2cap_send_cmd(conn, cmd.ident, L2CAP_COMMAND_REJ, sizeof(rej), &rej);
3226 }
3227
88219a0f
AV		 3228 data += cmd_len;
3229 len -= cmd_len;
1da177e4
LT		 3230 }
3231
3232 kfree_skb(skb);
3233}
3234
fcc203c3
GP		 3235static int l2cap_check_fcs(struct l2cap_pinfo *pi, struct sk_buff *skb)
3236{
3237 u16 our_fcs, rcv_fcs;
3238 int hdr_size = L2CAP_HDR_SIZE + 2;
3239
3240 if (pi->fcs == L2CAP_FCS_CRC16) {
3241 skb_trim(skb, skb->len - 2);
3242 rcv_fcs = get_unaligned_le16(skb->data + skb->len);
3243 our_fcs = crc16(0, skb->data - hdr_size, skb->len + hdr_size);
3244
3245 if (our_fcs != rcv_fcs)
3246 return -EINVAL;
3247 }
3248 return 0;
3249}
3250
d5392c8f
GP		 3251static inline void l2cap_send_i_or_rr_or_rnr(struct sock *sk)
3252{
3253 struct l2cap_pinfo *pi = l2cap_pi(sk);
3254 u16 control = 0;
3255
3256 pi->frames_sent = 0;
3257 pi->conn_state |= L2CAP_CONN_SEND_FBIT;
3258
3259 control |= pi->buffer_seq << L2CAP_CTRL_REQSEQ_SHIFT;
3260
3261 if (pi->conn_state & L2CAP_CONN_LOCAL_BUSY) {
3262 control |= L2CAP_SUPER_RCV_NOT_READY | L2CAP_CTRL_FINAL;
3263 l2cap_send_sframe(pi, control);
3264 pi->conn_state &= ~L2CAP_CONN_SEND_FBIT;
3265 }
3266
3267 if (pi->conn_state & L2CAP_CONN_REMOTE_BUSY && pi->unacked_frames > 0)
3268 __mod_retrans_timer();
3269
3270 l2cap_ertm_send(sk);
3271
3272 if (!(pi->conn_state & L2CAP_CONN_LOCAL_BUSY) &&
3273 pi->frames_sent == 0) {
3274 control |= L2CAP_SUPER_RCV_READY;
d5392c8f
GP		 3275 l2cap_send_sframe(pi, control);
3276 }
3277}
3278
8f17154f
GP		 3279static void l2cap_add_to_srej_queue(struct sock *sk, struct sk_buff *skb, u8 tx_seq, u8 sar)
3280{
3281 struct sk_buff *next_skb;
3282
3283 bt_cb(skb)->tx_seq = tx_seq;
3284 bt_cb(skb)->sar = sar;
3285
3286 next_skb = skb_peek(SREJ_QUEUE(sk));
3287 if (!next_skb) {
3288 __skb_queue_tail(SREJ_QUEUE(sk), skb);
3289 return;
3290 }
3291
3292 do {
3293 if (bt_cb(next_skb)->tx_seq > tx_seq) {
3294 __skb_queue_before(SREJ_QUEUE(sk), next_skb, skb);
3295 return;
3296 }
3297
3298 if (skb_queue_is_last(SREJ_QUEUE(sk), next_skb))
3299 break;
3300
3301 } while((next_skb = skb_queue_next(SREJ_QUEUE(sk), next_skb)));
3302
3303 __skb_queue_tail(SREJ_QUEUE(sk), skb);
3304}
3305
c74e560c
GP		 3306static int l2cap_sar_reassembly_sdu(struct sock *sk, struct sk_buff *skb, u16 control)
3307{
3308 struct l2cap_pinfo *pi = l2cap_pi(sk);
3309 struct sk_buff *_skb;
3310 int err = -EINVAL;
3311
3312 switch (control & L2CAP_CTRL_SAR) {
3313 case L2CAP_SDU_UNSEGMENTED:
3314 if (pi->conn_state & L2CAP_CONN_SAR_SDU) {
3315 kfree_skb(pi->sdu);
3316 break;
3317 }
3318
3319 err = sock_queue_rcv_skb(sk, skb);
3320 if (!err)
3321 return 0;
3322
3323 break;
3324
3325 case L2CAP_SDU_START:
3326 if (pi->conn_state & L2CAP_CONN_SAR_SDU) {
3327 kfree_skb(pi->sdu);
3328 break;
3329 }
3330
3331 pi->sdu_len = get_unaligned_le16(skb->data);
3332 skb_pull(skb, 2);
3333
3334 pi->sdu = bt_skb_alloc(pi->sdu_len, GFP_ATOMIC);
3335 if (!pi->sdu) {
3336 err = -ENOMEM;
3337 break;
3338 }
3339
3340 memcpy(skb_put(pi->sdu, skb->len), skb->data, skb->len);
3341
3342 pi->conn_state |= L2CAP_CONN_SAR_SDU;
3343 pi->partial_sdu_len = skb->len;
3344 err = 0;
3345 break;
3346
3347 case L2CAP_SDU_CONTINUE:
3348 if (!(pi->conn_state & L2CAP_CONN_SAR_SDU))
3349 break;
3350
3351 memcpy(skb_put(pi->sdu, skb->len), skb->data, skb->len);
3352
3353 pi->partial_sdu_len += skb->len;
3354 if (pi->partial_sdu_len > pi->sdu_len)
3355 kfree_skb(pi->sdu);
3356 else
3357 err = 0;
3358
3359 break;
3360
3361 case L2CAP_SDU_END:
3362 if (!(pi->conn_state & L2CAP_CONN_SAR_SDU))
3363 break;
3364
3365 memcpy(skb_put(pi->sdu, skb->len), skb->data, skb->len);
3366
3367 pi->conn_state &= ~L2CAP_CONN_SAR_SDU;
3368 pi->partial_sdu_len += skb->len;
3369
36f2fd58
GP		 3370 if (pi->partial_sdu_len > pi->imtu)
3371 goto drop;
3372
c74e560c
GP		 3373 if (pi->partial_sdu_len == pi->sdu_len) {
3374 _skb = skb_clone(pi->sdu, GFP_ATOMIC);
3375 err = sock_queue_rcv_skb(sk, _skb);
3376 if (err < 0)
3377 kfree_skb(_skb);
3378 }
c74e560c
GP		 3379 err = 0;
3380
36f2fd58
GP		 3381drop:
3382 kfree_skb(pi->sdu);
c74e560c
GP		 3383 break;
3384 }
3385
3386 kfree_skb(skb);
3387 return err;
3388}
3389
8f17154f
GP		 3390static void l2cap_check_srej_gap(struct sock *sk, u8 tx_seq)
3391{
3392 struct sk_buff *skb;
3393 u16 control = 0;
3394
3395 while((skb = skb_peek(SREJ_QUEUE(sk)))) {
3396 if (bt_cb(skb)->tx_seq != tx_seq)
3397 break;
3398
3399 skb = skb_dequeue(SREJ_QUEUE(sk));
3400 control |= bt_cb(skb)->sar << L2CAP_CTRL_SAR_SHIFT;
3401 l2cap_sar_reassembly_sdu(sk, skb, control);
3402 l2cap_pi(sk)->buffer_seq_srej =
3403 (l2cap_pi(sk)->buffer_seq_srej + 1) % 64;
3404 tx_seq++;
3405 }
3406}
3407
3408static void l2cap_resend_srejframe(struct sock *sk, u8 tx_seq)
3409{
3410 struct l2cap_pinfo *pi = l2cap_pi(sk);
3411 struct srej_list *l, *tmp;
3412 u16 control;
3413
3414 list_for_each_entry_safe(l,tmp, SREJ_LIST(sk), list) {
3415 if (l->tx_seq == tx_seq) {
3416 list_del(&l->list);
3417 kfree(l);
3418 return;
3419 }
3420 control = L2CAP_SUPER_SELECT_REJECT;
3421 control |= l->tx_seq << L2CAP_CTRL_REQSEQ_SHIFT;
3422 l2cap_send_sframe(pi, control);
3423 list_del(&l->list);
3424 list_add_tail(&l->list, SREJ_LIST(sk));
3425 }
3426}
3427
3428static void l2cap_send_srejframe(struct sock *sk, u8 tx_seq)
3429{
3430 struct l2cap_pinfo *pi = l2cap_pi(sk);
3431 struct srej_list *new;
3432 u16 control;
3433
3434 while (tx_seq != pi->expected_tx_seq) {
3435 control = L2CAP_SUPER_SELECT_REJECT;
3436 control |= pi->expected_tx_seq << L2CAP_CTRL_REQSEQ_SHIFT;
3437 l2cap_send_sframe(pi, control);
3438
3439 new = kzalloc(sizeof(struct srej_list), GFP_ATOMIC);
3440 new->tx_seq = pi->expected_tx_seq++;
3441 list_add_tail(&new->list, SREJ_LIST(sk));
3442 }
3443 pi->expected_tx_seq++;
3444}
3445
1c2acffb
GP		 3446static inline int l2cap_data_channel_iframe(struct sock *sk, u16 rx_control, struct sk_buff *skb)
3447{
3448 struct l2cap_pinfo *pi = l2cap_pi(sk);
3449 u8 tx_seq = __get_txseq(rx_control);
9f121a5a 3450 u8 req_seq = __get_reqseq(rx_control);
8f17154f 3451 u8 sar = rx_control >> L2CAP_CTRL_SAR_SHIFT;
1c2acffb
GP		 3452 int err = 0;
3453
3454 BT_DBG("sk %p rx_control 0x%4.4x len %d", sk, rx_control, skb->len);
3455
1d8f5d16
GP		 3456 if (L2CAP_CTRL_FINAL & rx_control) {
3457 del_timer(&pi->monitor_timer);
3458 if (pi->unacked_frames > 0)
3459 __mod_retrans_timer();
3460 pi->conn_state &= ~L2CAP_CONN_WAIT_F;
3461 }
3462
9f121a5a
GP		 3463 pi->expected_ack_seq = req_seq;
3464 l2cap_drop_acked_frames(sk);
3465
8f17154f
GP		 3466 if (tx_seq == pi->expected_tx_seq)
3467 goto expected;
1c2acffb 3468
8f17154f
GP		 3469 if (pi->conn_state & L2CAP_CONN_SREJ_SENT) {
3470 struct srej_list *first;
30afb5b2 3471
8f17154f
GP		 3472 first = list_first_entry(SREJ_LIST(sk),
3473 struct srej_list, list);
3474 if (tx_seq == first->tx_seq) {
3475 l2cap_add_to_srej_queue(sk, skb, tx_seq, sar);
3476 l2cap_check_srej_gap(sk, tx_seq);
3477
3478 list_del(&first->list);
3479 kfree(first);
3480
3481 if (list_empty(SREJ_LIST(sk))) {
3482 pi->buffer_seq = pi->buffer_seq_srej;
3483 pi->conn_state &= ~L2CAP_CONN_SREJ_SENT;
3484 }
3485 } else {
3486 struct srej_list *l;
3487 l2cap_add_to_srej_queue(sk, skb, tx_seq, sar);
3488
3489 list_for_each_entry(l, SREJ_LIST(sk), list) {
3490 if (l->tx_seq == tx_seq) {
3491 l2cap_resend_srejframe(sk, tx_seq);
3492 return 0;
3493 }
3494 }
3495 l2cap_send_srejframe(sk, tx_seq);
30afb5b2
GP		 3496 }
3497 } else {
8f17154f 3498 pi->conn_state |= L2CAP_CONN_SREJ_SENT;
1c2acffb 3499
8f17154f
GP		 3500 INIT_LIST_HEAD(SREJ_LIST(sk));
3501 pi->buffer_seq_srej = pi->buffer_seq;
3502
3503 __skb_queue_head_init(SREJ_QUEUE(sk));
3504 l2cap_add_to_srej_queue(sk, skb, tx_seq, sar);
3505
ef54fd93
GP		 3506 pi->conn_state |= L2CAP_CONN_SEND_PBIT;
3507
8f17154f 3508 l2cap_send_srejframe(sk, tx_seq);
1c2acffb 3509 }
30afb5b2
GP		 3510 return 0;
3511
8f17154f
GP		 3512expected:
3513 pi->expected_tx_seq = (pi->expected_tx_seq + 1) % 64;
3514
3515 if (pi->conn_state & L2CAP_CONN_SREJ_SENT) {
3516 l2cap_add_to_srej_queue(sk, skb, tx_seq, sar);
3517 return 0;
3518 }
3519
4ec10d97
GP		 3520 if (rx_control & L2CAP_CTRL_FINAL) {
3521 if (pi->conn_state & L2CAP_CONN_REJ_ACT)
3522 pi->conn_state &= ~L2CAP_CONN_REJ_ACT;
3523 else {
3524 sk->sk_send_head = TX_QUEUE(sk)->next;
3525 pi->next_tx_seq = pi->expected_ack_seq;
3526 l2cap_ertm_send(sk);
3527 }
3528 }
3529
8f17154f
GP		 3530 pi->buffer_seq = (pi->buffer_seq + 1) % 64;
3531
3532 err = l2cap_sar_reassembly_sdu(sk, skb, rx_control);
3533 if (err < 0)
3534 return err;
3535
c1b4f43b
GP		 3536 __mod_ack_timer();
3537
8f17154f 3538 pi->num_to_ack = (pi->num_to_ack + 1) % L2CAP_DEFAULT_NUM_TO_ACK;
9e917af1
GP		 3539 if (pi->num_to_ack == L2CAP_DEFAULT_NUM_TO_ACK - 1)
3540 l2cap_send_ack(pi);
3541
8f17154f 3542 return 0;
1c2acffb
GP		 3543}
3544
e072745f 3545static inline void l2cap_data_channel_rrframe(struct sock *sk, u16 rx_control)
1c2acffb
GP		 3546{
3547 struct l2cap_pinfo *pi = l2cap_pi(sk);
6e3a5981
GP		 3548
3549 pi->expected_ack_seq = __get_reqseq(rx_control);
3550 l2cap_drop_acked_frames(sk);
1c2acffb 3551
e072745f 3552 if (rx_control & L2CAP_CTRL_POLL) {
05fbd89d
GP		 3553 if (pi->conn_state & L2CAP_CONN_SREJ_SENT) {
3554 if ((pi->conn_state & L2CAP_CONN_REMOTE_BUSY) &&
3555 (pi->unacked_frames > 0))
3556 __mod_retrans_timer();
3557
3558 pi->conn_state &= ~L2CAP_CONN_REMOTE_BUSY;
3559 l2cap_send_srejtail(sk);
3560 } else {
3561 l2cap_send_i_or_rr_or_rnr(sk);
3562 pi->conn_state &= ~L2CAP_CONN_REMOTE_BUSY;
3563 }
1d8f5d16 3564
e072745f
GP		 3565 } else if (rx_control & L2CAP_CTRL_FINAL) {
3566 pi->conn_state &= ~L2CAP_CONN_REMOTE_BUSY;
4ec10d97 3567
e072745f
GP		 3568 if (pi->conn_state & L2CAP_CONN_REJ_ACT)
3569 pi->conn_state &= ~L2CAP_CONN_REJ_ACT;
3570 else {
3571 sk->sk_send_head = TX_QUEUE(sk)->next;
3572 pi->next_tx_seq = pi->expected_ack_seq;
3573 l2cap_ertm_send(sk);
3574 }
2246b2f1 3575
e072745f 3576 } else {
e072745f
GP		 3577 if ((pi->conn_state & L2CAP_CONN_REMOTE_BUSY) &&
3578 (pi->unacked_frames > 0))
3579 __mod_retrans_timer();
1c2acffb 3580
2246b2f1 3581 pi->conn_state &= ~L2CAP_CONN_REMOTE_BUSY;
e072745f
GP		 3582 if (pi->conn_state & L2CAP_CONN_SREJ_SENT)
3583 l2cap_send_ack(pi);
3584 else
3585 l2cap_ertm_send(sk);
3586 }
3587}
2246b2f1 3588
e072745f
GP		 3589static inline void l2cap_data_channel_rejframe(struct sock *sk, u16 rx_control)
3590{
3591 struct l2cap_pinfo *pi = l2cap_pi(sk);
3592 u8 tx_seq = __get_reqseq(rx_control);
30afb5b2 3593
e072745f
GP		 3594 pi->conn_state &= ~L2CAP_CONN_REMOTE_BUSY;
3595
8abb52ee 3596 pi->expected_ack_seq = tx_seq;
e072745f
GP		 3597 l2cap_drop_acked_frames(sk);
3598
3599 if (rx_control & L2CAP_CTRL_FINAL) {
3600 if (pi->conn_state & L2CAP_CONN_REJ_ACT)
3601 pi->conn_state &= ~L2CAP_CONN_REJ_ACT;
3602 else {
4ec10d97
GP		 3603 sk->sk_send_head = TX_QUEUE(sk)->next;
3604 pi->next_tx_seq = pi->expected_ack_seq;
3605 l2cap_ertm_send(sk);
4ec10d97 3606 }
e072745f
GP		 3607 } else {
3608 sk->sk_send_head = TX_QUEUE(sk)->next;
3609 pi->next_tx_seq = pi->expected_ack_seq;
3610 l2cap_ertm_send(sk);
30afb5b2 3611
e072745f
GP		 3612 if (pi->conn_state & L2CAP_CONN_WAIT_F) {
3613 pi->srej_save_reqseq = tx_seq;
3614 pi->conn_state |= L2CAP_CONN_REJ_ACT;
3615 }
3616 }
3617}
3618static inline void l2cap_data_channel_srejframe(struct sock *sk, u16 rx_control)
3619{
3620 struct l2cap_pinfo *pi = l2cap_pi(sk);
3621 u8 tx_seq = __get_reqseq(rx_control);
30afb5b2 3622
e072745f 3623 pi->conn_state &= ~L2CAP_CONN_REMOTE_BUSY;
2246b2f1 3624
e072745f
GP		 3625 if (rx_control & L2CAP_CTRL_POLL) {
3626 pi->expected_ack_seq = tx_seq;
3627 l2cap_drop_acked_frames(sk);
3628 l2cap_retransmit_frame(sk, tx_seq);
3629 l2cap_ertm_send(sk);
3630 if (pi->conn_state & L2CAP_CONN_WAIT_F) {
3631 pi->srej_save_reqseq = tx_seq;
3632 pi->conn_state |= L2CAP_CONN_SREJ_ACT;
ef54fd93 3633 }
e072745f
GP		 3634 } else if (rx_control & L2CAP_CTRL_FINAL) {
3635 if ((pi->conn_state & L2CAP_CONN_SREJ_ACT) &&
3636 pi->srej_save_reqseq == tx_seq)
3637 pi->conn_state &= ~L2CAP_CONN_SREJ_ACT;
3638 else
ef54fd93 3639 l2cap_retransmit_frame(sk, tx_seq);
e072745f
GP		 3640 } else {
3641 l2cap_retransmit_frame(sk, tx_seq);
3642 if (pi->conn_state & L2CAP_CONN_WAIT_F) {
3643 pi->srej_save_reqseq = tx_seq;
3644 pi->conn_state |= L2CAP_CONN_SREJ_ACT;
ef54fd93 3645 }
e072745f
GP		 3646 }
3647}
3648
3649static inline void l2cap_data_channel_rnrframe(struct sock *sk, u16 rx_control)
3650{
3651 struct l2cap_pinfo *pi = l2cap_pi(sk);
3652 u8 tx_seq = __get_reqseq(rx_control);
3653
3654 pi->conn_state |= L2CAP_CONN_REMOTE_BUSY;
3655 pi->expected_ack_seq = tx_seq;
3656 l2cap_drop_acked_frames(sk);
3657
99b0d4b7
GP		 3658 if (!(pi->conn_state & L2CAP_CONN_SREJ_SENT)) {
3659 del_timer(&pi->retrans_timer);
3660 if (rx_control & L2CAP_CTRL_POLL) {
3661 u16 control = L2CAP_CTRL_FINAL;
3662 l2cap_send_rr_or_rnr(pi, control);
3663 }
3664 return;
e072745f 3665 }
99b0d4b7
GP		 3666
3667 if (rx_control & L2CAP_CTRL_POLL)
3668 l2cap_send_srejtail(sk);
3669 else
3670 l2cap_send_sframe(pi, L2CAP_SUPER_RCV_READY);
e072745f
GP		 3671}
3672
3673static inline int l2cap_data_channel_sframe(struct sock *sk, u16 rx_control, struct sk_buff *skb)
3674{
3675 BT_DBG("sk %p rx_control 0x%4.4x len %d", sk, rx_control, skb->len);
3676
3677 if (L2CAP_CTRL_FINAL & rx_control) {
3678 del_timer(&l2cap_pi(sk)->monitor_timer);
3679 if (l2cap_pi(sk)->unacked_frames > 0)
3680 __mod_retrans_timer();
3681 l2cap_pi(sk)->conn_state &= ~L2CAP_CONN_WAIT_F;
3682 }
3683
3684 switch (rx_control & L2CAP_CTRL_SUPERVISE) {
3685 case L2CAP_SUPER_RCV_READY:
3686 l2cap_data_channel_rrframe(sk, rx_control);
8f17154f
GP		 3687 break;
3688
e072745f
GP		 3689 case L2CAP_SUPER_REJECT:
3690 l2cap_data_channel_rejframe(sk, rx_control);
3691 break;
2246b2f1 3692
e072745f
GP		 3693 case L2CAP_SUPER_SELECT_REJECT:
3694 l2cap_data_channel_srejframe(sk, rx_control);
3695 break;
3696
3697 case L2CAP_SUPER_RCV_NOT_READY:
3698 l2cap_data_channel_rnrframe(sk, rx_control);
1c2acffb
GP		 3699 break;
3700 }
3701
faaebd19 3702 kfree_skb(skb);
1c2acffb
GP		 3703 return 0;
3704}
3705
1da177e4
LT		 3706static inline int l2cap_data_channel(struct l2cap_conn *conn, u16 cid, struct sk_buff *skb)
3707{
3708 struct sock *sk;
6840ed07 3709 struct l2cap_pinfo *pi;
c74e560c 3710 u16 control, len;
6840ed07 3711 u8 tx_seq;
1da177e4
LT		 3712
3713 sk = l2cap_get_chan_by_scid(&conn->chan_list, cid);
3714 if (!sk) {
3715 BT_DBG("unknown cid 0x%4.4x", cid);
3716 goto drop;
3717 }
3718
6840ed07
GP		 3719 pi = l2cap_pi(sk);
3720
1da177e4
LT		 3721 BT_DBG("sk %p, len %d", sk, skb->len);
3722
3723 if (sk->sk_state != BT_CONNECTED)
3724 goto drop;
3725
6840ed07 3726 switch (pi->mode) {
1c2acffb
GP		 3727 case L2CAP_MODE_BASIC:
3728 /* If socket recv buffers overflows we drop data here
3729 * which is *bad* because L2CAP has to be reliable.
3730 * But we don't have any other choice. L2CAP doesn't
3731 * provide flow control mechanism. */
1da177e4 3732
6840ed07 3733 if (pi->imtu < skb->len)
1c2acffb 3734 goto drop;
1da177e4 3735
1c2acffb
GP		 3736 if (!sock_queue_rcv_skb(sk, skb))
3737 goto done;
3738 break;
3739
3740 case L2CAP_MODE_ERTM:
3741 control = get_unaligned_le16(skb->data);
3742 skb_pull(skb, 2);
c74e560c 3743 len = skb->len;
1c2acffb 3744
c74e560c
GP		 3745 if (__is_sar_start(control))
3746 len -= 2;
3747
fcc203c3
GP		 3748 if (pi->fcs == L2CAP_FCS_CRC16)
3749 len -= 2;
3750
30afb5b2
GP		 3751 /*
3752 * We can just drop the corrupted I-frame here.
3753 * Receiver will miss it and start proper recovery
3754 * procedures and ask retransmission.
3755 */
c74e560c 3756 if (len > L2CAP_DEFAULT_MAX_PDU_SIZE)
1c2acffb
GP		 3757 goto drop;
3758
fcc203c3
GP		 3759 if (l2cap_check_fcs(pi, skb))
3760 goto drop;
3761
277ffbe3
GP		 3762 if (__is_iframe(control)) {
3763 if (len < 4)
3764 goto drop;
3765
fcafde2e 3766 l2cap_data_channel_iframe(sk, control, skb);
277ffbe3
GP		 3767 } else {
3768 if (len != 0)
3769 goto drop;
3770
fcafde2e 3771 l2cap_data_channel_sframe(sk, control, skb);
277ffbe3 3772 }
1c2acffb 3773
fcafde2e 3774 goto done;
1c2acffb 3775
6840ed07
GP		 3776 case L2CAP_MODE_STREAMING:
3777 control = get_unaligned_le16(skb->data);
3778 skb_pull(skb, 2);
3779 len = skb->len;
3780
3781 if (__is_sar_start(control))
3782 len -= 2;
3783
fcc203c3
GP		 3784 if (pi->fcs == L2CAP_FCS_CRC16)
3785 len -= 2;
3786
277ffbe3
GP		 3787 if (len > L2CAP_DEFAULT_MAX_PDU_SIZE || len < 4
3788 || __is_sframe(control))
6840ed07
GP		 3789 goto drop;
3790
fcc203c3
GP		 3791 if (l2cap_check_fcs(pi, skb))
3792 goto drop;
3793
6840ed07
GP		 3794 tx_seq = __get_txseq(control);
3795
3796 if (pi->expected_tx_seq == tx_seq)
3797 pi->expected_tx_seq = (pi->expected_tx_seq + 1) % 64;
3798 else
7dffe421 3799 pi->expected_tx_seq = (tx_seq + 1) % 64;
6840ed07 3800
fcafde2e 3801 l2cap_sar_reassembly_sdu(sk, skb, control);
6840ed07
GP		 3802
3803 goto done;
3804
1c2acffb 3805 default:
e8235c6b 3806 BT_DBG("sk %p: bad mode 0x%2.2x", sk, pi->mode);
1c2acffb
GP		 3807 break;
3808 }
1da177e4
LT		 3809
3810drop:
3811 kfree_skb(skb);
3812
3813done:
0139418c
MH		 3814 if (sk)
3815 bh_unlock_sock(sk);
3816
1da177e4
LT		 3817 return 0;
3818}
3819
8e036fc3 3820static inline int l2cap_conless_channel(struct l2cap_conn *conn, __le16 psm, struct sk_buff *skb)
1da177e4
LT		 3821{
3822 struct sock *sk;
3823
3824 sk = l2cap_get_sock_by_psm(0, psm, conn->src);
3825 if (!sk)
3826 goto drop;
3827
3828 BT_DBG("sk %p, len %d", sk, skb->len);
3829
3830 if (sk->sk_state != BT_BOUND && sk->sk_state != BT_CONNECTED)
3831 goto drop;
3832
3833 if (l2cap_pi(sk)->imtu < skb->len)
3834 goto drop;
3835
3836 if (!sock_queue_rcv_skb(sk, skb))
3837 goto done;
3838
3839drop:
3840 kfree_skb(skb);
3841
3842done:
af05b30b
GP		 3843 if (sk)
3844 bh_unlock_sock(sk);
1da177e4
LT		 3845 return 0;
3846}
3847
3848static void l2cap_recv_frame(struct l2cap_conn *conn, struct sk_buff *skb)
3849{
3850 struct l2cap_hdr *lh = (void *) skb->data;
8e036fc3
AV		 3851 u16 cid, len;
3852 __le16 psm;
1da177e4
LT		 3853
3854 skb_pull(skb, L2CAP_HDR_SIZE);
3855 cid = __le16_to_cpu(lh->cid);
3856 len = __le16_to_cpu(lh->len);
3857
1c2acffb
GP		 3858 if (len != skb->len) {
3859 kfree_skb(skb);
3860 return;
3861 }
3862
1da177e4
LT		 3863 BT_DBG("len %d, cid 0x%4.4x", len, cid);
3864
3865 switch (cid) {
8db4dc46 3866 case L2CAP_CID_SIGNALING:
1da177e4
LT		 3867 l2cap_sig_channel(conn, skb);
3868 break;
3869
8db4dc46 3870 case L2CAP_CID_CONN_LESS:
1b7bf4ed 3871 psm = get_unaligned_le16(skb->data);
1da177e4
LT		 3872 skb_pull(skb, 2);
3873 l2cap_conless_channel(conn, psm, skb);
3874 break;
3875
3876 default:
3877 l2cap_data_channel(conn, cid, skb);
3878 break;
3879 }
3880}
3881
3882/* ---- L2CAP interface with lower layer (HCI) ---- */
3883
3884static int l2cap_connect_ind(struct hci_dev *hdev, bdaddr_t *bdaddr, u8 type)
3885{
3886 int exact = 0, lm1 = 0, lm2 = 0;
3887 register struct sock *sk;
3888 struct hlist_node *node;
3889
3890 if (type != ACL_LINK)
3891 return 0;
3892
3893 BT_DBG("hdev %s, bdaddr %s", hdev->name, batostr(bdaddr));
3894
3895 /* Find listening sockets and check their link_mode */
3896 read_lock(&l2cap_sk_list.lock);
3897 sk_for_each(sk, node, &l2cap_sk_list.head) {
3898 if (sk->sk_state != BT_LISTEN)
3899 continue;
3900
3901 if (!bacmp(&bt_sk(sk)->src, &hdev->bdaddr)) {
2af6b9d5
MH		 3902 lm1 |= HCI_LM_ACCEPT;
3903 if (l2cap_pi(sk)->role_switch)
3904 lm1 |= HCI_LM_MASTER;
1da177e4 3905 exact++;
2af6b9d5
MH		 3906 } else if (!bacmp(&bt_sk(sk)->src, BDADDR_ANY)) {
3907 lm2 |= HCI_LM_ACCEPT;
3908 if (l2cap_pi(sk)->role_switch)
3909 lm2 |= HCI_LM_MASTER;
3910 }
1da177e4
LT		 3911 }
3912 read_unlock(&l2cap_sk_list.lock);
3913
3914 return exact ? lm1 : lm2;
3915}
3916
3917static int l2cap_connect_cfm(struct hci_conn *hcon, u8 status)
3918{
0139418c
MH		 3919 struct l2cap_conn *conn;
3920
1da177e4
LT		 3921 BT_DBG("hcon %p bdaddr %s status %d", hcon, batostr(&hcon->dst), status);
3922
3923 if (hcon->type != ACL_LINK)
3924 return 0;
3925
3926 if (!status) {
1da177e4
LT		 3927 conn = l2cap_conn_add(hcon, status);
3928 if (conn)
3929 l2cap_conn_ready(conn);
0139418c 3930 } else
1da177e4
LT		 3931 l2cap_conn_del(hcon, bt_err(status));
3932
3933 return 0;
3934}
3935
2950f21a
MH		 3936static int l2cap_disconn_ind(struct hci_conn *hcon)
3937{
3938 struct l2cap_conn *conn = hcon->l2cap_data;
3939
3940 BT_DBG("hcon %p", hcon);
3941
3942 if (hcon->type != ACL_LINK || !conn)
3943 return 0x13;
3944
3945 return conn->disc_reason;
3946}
3947
3948static int l2cap_disconn_cfm(struct hci_conn *hcon, u8 reason)
1da177e4
LT		 3949{
3950 BT_DBG("hcon %p reason %d", hcon, reason);
3951
3952 if (hcon->type != ACL_LINK)
3953 return 0;
3954
3955 l2cap_conn_del(hcon, bt_err(reason));
0139418c 3956
1da177e4
LT		 3957 return 0;
3958}
3959
f62e4323
MH		 3960static inline void l2cap_check_encryption(struct sock *sk, u8 encrypt)
3961{
255c7601
MH		 3962 if (sk->sk_type != SOCK_SEQPACKET)
3963 return;
3964
f62e4323
MH		 3965 if (encrypt == 0x00) {
3966 if (l2cap_pi(sk)->sec_level == BT_SECURITY_MEDIUM) {
3967 l2cap_sock_clear_timer(sk);
3968 l2cap_sock_set_timer(sk, HZ * 5);
3969 } else if (l2cap_pi(sk)->sec_level == BT_SECURITY_HIGH)
3970 __l2cap_sock_close(sk, ECONNREFUSED);
3971 } else {
3972 if (l2cap_pi(sk)->sec_level == BT_SECURITY_MEDIUM)
3973 l2cap_sock_clear_timer(sk);
3974 }
3975}
3976
8c1b2355 3977static int l2cap_security_cfm(struct hci_conn *hcon, u8 status, u8 encrypt)
1da177e4
LT		 3978{
3979 struct l2cap_chan_list *l;
0139418c 3980 struct l2cap_conn *conn = hcon->l2cap_data;
1da177e4 3981 struct sock *sk;
1da177e4 3982
0139418c 3983 if (!conn)
1da177e4 3984 return 0;
0139418c 3985
1da177e4
LT		 3986 l = &conn->chan_list;
3987
3988 BT_DBG("conn %p", conn);
3989
3990 read_lock(&l->lock);
3991
3992 for (sk = l->head; sk; sk = l2cap_pi(sk)->next_c) {
3993 bh_lock_sock(sk);
3994
6a8d3010
MH		 3995 if (l2cap_pi(sk)->conf_state & L2CAP_CONF_CONNECT_PEND) {
3996 bh_unlock_sock(sk);
3997 continue;
3998 }
3999
f62e4323 4000 if (!status && (sk->sk_state == BT_CONNECTED ||
8c1b2355 4001 sk->sk_state == BT_CONFIG)) {
f62e4323 4002 l2cap_check_encryption(sk, encrypt);
9719f8af
MH		 4003 bh_unlock_sock(sk);
4004 continue;
4005 }
4006
b1235d79
MH		 4007 if (sk->sk_state == BT_CONNECT) {
4008 if (!status) {
4009 struct l2cap_conn_req req;
4010 req.scid = cpu_to_le16(l2cap_pi(sk)->scid);
4011 req.psm = l2cap_pi(sk)->psm;
1da177e4 4012
b1235d79 4013 l2cap_pi(sk)->ident = l2cap_get_ident(conn);
1da177e4 4014
b1235d79
MH		 4015 l2cap_send_cmd(conn, l2cap_pi(sk)->ident,
4016 L2CAP_CONN_REQ, sizeof(req), &req);
4017 } else {
4018 l2cap_sock_clear_timer(sk);
4019 l2cap_sock_set_timer(sk, HZ / 10);
4020 }
4021 } else if (sk->sk_state == BT_CONNECT2) {
4022 struct l2cap_conn_rsp rsp;
4023 __u16 result;
1da177e4 4024
b1235d79
MH		 4025 if (!status) {
4026 sk->sk_state = BT_CONFIG;
4027 result = L2CAP_CR_SUCCESS;
4028 } else {
4029 sk->sk_state = BT_DISCONN;
4030 l2cap_sock_set_timer(sk, HZ / 10);
4031 result = L2CAP_CR_SEC_BLOCK;
4032 }
4033
4034 rsp.scid = cpu_to_le16(l2cap_pi(sk)->dcid);
4035 rsp.dcid = cpu_to_le16(l2cap_pi(sk)->scid);
4036 rsp.result = cpu_to_le16(result);
e7c29cb1 4037 rsp.status = cpu_to_le16(L2CAP_CS_NO_INFO);
b1235d79
MH		 4038 l2cap_send_cmd(conn, l2cap_pi(sk)->ident,
4039 L2CAP_CONN_RSP, sizeof(rsp), &rsp);
4040 }
1da177e4
LT		 4041
4042 bh_unlock_sock(sk);
4043 }
4044
4045 read_unlock(&l->lock);
b1235d79 4046
1da177e4
LT		 4047 return 0;
4048}
4049
4050static int l2cap_recv_acldata(struct hci_conn *hcon, struct sk_buff *skb, u16 flags)
4051{
4052 struct l2cap_conn *conn = hcon->l2cap_data;
4053
4054 if (!conn && !(conn = l2cap_conn_add(hcon, 0)))
4055 goto drop;
4056
4057 BT_DBG("conn %p len %d flags 0x%x", conn, skb->len, flags);
4058
4059 if (flags & ACL_START) {
4060 struct l2cap_hdr *hdr;
4061 int len;
4062
4063 if (conn->rx_len) {
4064 BT_ERR("Unexpected start frame (len %d)", skb->len);
4065 kfree_skb(conn->rx_skb);
4066 conn->rx_skb = NULL;
4067 conn->rx_len = 0;
4068 l2cap_conn_unreliable(conn, ECOMM);
4069 }
4070
4071 if (skb->len < 2) {
4072 BT_ERR("Frame is too short (len %d)", skb->len);
4073 l2cap_conn_unreliable(conn, ECOMM);
4074 goto drop;
4075 }
4076
4077 hdr = (struct l2cap_hdr *) skb->data;
4078 len = __le16_to_cpu(hdr->len) + L2CAP_HDR_SIZE;
4079
4080 if (len == skb->len) {
4081 /* Complete frame received */
4082 l2cap_recv_frame(conn, skb);
4083 return 0;
4084 }
4085
4086 BT_DBG("Start: total len %d, frag len %d", len, skb->len);
4087
4088 if (skb->len > len) {
4089 BT_ERR("Frame is too long (len %d, expected len %d)",
4090 skb->len, len);
4091 l2cap_conn_unreliable(conn, ECOMM);
4092 goto drop;
4093 }
4094
4095 /* Allocate skb for the complete frame (with header) */
af05b30b
GP		 4096 conn->rx_skb = bt_skb_alloc(len, GFP_ATOMIC);
4097 if (!conn->rx_skb)
1da177e4
LT		 4098 goto drop;
4099
d626f62b 4100 skb_copy_from_linear_data(skb, skb_put(conn->rx_skb, skb->len),
e1027a7c 4101 skb->len);
1da177e4
LT		 4102 conn->rx_len = len - skb->len;
4103 } else {
4104 BT_DBG("Cont: frag len %d (expecting %d)", skb->len, conn->rx_len);
4105
4106 if (!conn->rx_len) {
4107 BT_ERR("Unexpected continuation frame (len %d)", skb->len);
4108 l2cap_conn_unreliable(conn, ECOMM);
4109 goto drop;
4110 }
4111
4112 if (skb->len > conn->rx_len) {
4113 BT_ERR("Fragment is too long (len %d, expected %d)",
4114 skb->len, conn->rx_len);
4115 kfree_skb(conn->rx_skb);
4116 conn->rx_skb = NULL;
4117 conn->rx_len = 0;
4118 l2cap_conn_unreliable(conn, ECOMM);
4119 goto drop;
4120 }
4121
d626f62b 4122 skb_copy_from_linear_data(skb, skb_put(conn->rx_skb, skb->len),
e1027a7c 4123 skb->len);
1da177e4
LT		 4124 conn->rx_len -= skb->len;
4125
4126 if (!conn->rx_len) {
4127 /* Complete frame received */
4128 l2cap_recv_frame(conn, conn->rx_skb);
4129 conn->rx_skb = NULL;
4130 }
4131 }
4132
4133drop:
4134 kfree_skb(skb);
4135 return 0;
4136}
4137
aef7d97c 4138static int l2cap_debugfs_show(struct seq_file *f, void *p)
1da177e4
LT		 4139{
4140 struct sock *sk;
4141 struct hlist_node *node;
1da177e4
LT		 4142
4143 read_lock_bh(&l2cap_sk_list.lock);
4144
be9d1227
MH		 4145 sk_for_each(sk, node, &l2cap_sk_list.head) {
4146 struct l2cap_pinfo *pi = l2cap_pi(sk);
101545f6 4147
aef7d97c
MH		 4148 seq_printf(f, "%s %s %d %d 0x%4.4x 0x%4.4x %d %d %d\n",
4149 batostr(&bt_sk(sk)->src),
4150 batostr(&bt_sk(sk)->dst),
4151 sk->sk_state, __le16_to_cpu(pi->psm),
4152 pi->scid, pi->dcid,
4153 pi->imtu, pi->omtu, pi->sec_level);
be9d1227 4154 }
1da177e4 4155
1da177e4 4156 read_unlock_bh(&l2cap_sk_list.lock);
1da177e4 4157
aef7d97c 4158 return 0;
1da177e4
LT		 4159}
4160
aef7d97c
MH		 4161static int l2cap_debugfs_open(struct inode *inode, struct file *file)
4162{
4163 return single_open(file, l2cap_debugfs_show, inode->i_private);
4164}
4165
4166static const struct file_operations l2cap_debugfs_fops = {
4167 .open = l2cap_debugfs_open,
4168 .read = seq_read,
4169 .llseek = seq_lseek,
4170 .release = single_release,
4171};
4172
4173static struct dentry *l2cap_debugfs;
1da177e4 4174
90ddc4f0 4175static const struct proto_ops l2cap_sock_ops = {
1da177e4
LT		 4176 .family = PF_BLUETOOTH,
4177 .owner = THIS_MODULE,
4178 .release = l2cap_sock_release,
4179 .bind = l2cap_sock_bind,
4180 .connect = l2cap_sock_connect,
4181 .listen = l2cap_sock_listen,
4182 .accept = l2cap_sock_accept,
4183 .getname = l2cap_sock_getname,
4184 .sendmsg = l2cap_sock_sendmsg,
f66dc81f 4185 .recvmsg = l2cap_sock_recvmsg,
1da177e4 4186 .poll = bt_sock_poll,
3241ad82 4187 .ioctl = bt_sock_ioctl,
1da177e4
LT		 4188 .mmap = sock_no_mmap,
4189 .socketpair = sock_no_socketpair,
1da177e4
LT		 4190 .shutdown = l2cap_sock_shutdown,
4191 .setsockopt = l2cap_sock_setsockopt,
4192 .getsockopt = l2cap_sock_getsockopt
4193};
4194
ec1b4cf7 4195static const struct net_proto_family l2cap_sock_family_ops = {
1da177e4
LT		 4196 .family = PF_BLUETOOTH,
4197 .owner = THIS_MODULE,
4198 .create = l2cap_sock_create,
4199};
4200
4201static struct hci_proto l2cap_hci_proto = {
4202 .name = "L2CAP",
4203 .id = HCI_PROTO_L2CAP,
4204 .connect_ind = l2cap_connect_ind,
4205 .connect_cfm = l2cap_connect_cfm,
4206 .disconn_ind = l2cap_disconn_ind,
2950f21a 4207 .disconn_cfm = l2cap_disconn_cfm,
8c1b2355 4208 .security_cfm = l2cap_security_cfm,
1da177e4
LT		 4209 .recv_acldata = l2cap_recv_acldata
4210};
4211
4212static int __init l2cap_init(void)
4213{
4214 int err;
be9d1227 4215
1da177e4
LT		 4216 err = proto_register(&l2cap_proto, 0);
4217 if (err < 0)
4218 return err;
4219
4220 err = bt_sock_register(BTPROTO_L2CAP, &l2cap_sock_family_ops);
4221 if (err < 0) {
4222 BT_ERR("L2CAP socket registration failed");
4223 goto error;
4224 }
4225
4226 err = hci_register_proto(&l2cap_hci_proto);
4227 if (err < 0) {
4228 BT_ERR("L2CAP protocol registration failed");
4229 bt_sock_unregister(BTPROTO_L2CAP);
4230 goto error;
4231 }
4232
aef7d97c
MH		 4233 if (bt_debugfs) {
4234 l2cap_debugfs = debugfs_create_file("l2cap", 0444,
4235 bt_debugfs, NULL, &l2cap_debugfs_fops);
4236 if (!l2cap_debugfs)
4237 BT_ERR("Failed to create L2CAP debug file");
4238 }
1da177e4
LT		 4239
4240 BT_INFO("L2CAP ver %s", VERSION);
4241 BT_INFO("L2CAP socket layer initialized");
4242
4243 return 0;
4244
4245error:
4246 proto_unregister(&l2cap_proto);
4247 return err;
4248}
4249
4250static void __exit l2cap_exit(void)
4251{
aef7d97c 4252 debugfs_remove(l2cap_debugfs);
1da177e4
LT		 4253
4254 if (bt_sock_unregister(BTPROTO_L2CAP) < 0)
4255 BT_ERR("L2CAP socket unregistration failed");
4256
4257 if (hci_unregister_proto(&l2cap_hci_proto) < 0)
4258 BT_ERR("L2CAP protocol unregistration failed");
4259
4260 proto_unregister(&l2cap_proto);
4261}
4262
4263void l2cap_load(void)
4264{
4265 /* Dummy function to trigger automatic L2CAP module loading by
4266 * other modules that use L2CAP sockets but don't use any other
4267 * symbols from it. */
4268 return;
4269}
4270EXPORT_SYMBOL(l2cap_load);
4271
4272module_init(l2cap_init);
4273module_exit(l2cap_exit);
4274
44dd46de
MH		 4275module_param(enable_ertm, bool, 0644);
4276MODULE_PARM_DESC(enable_ertm, "Enable enhanced retransmission mode");
4277
5fbcd3d1
MH		 4278module_param(max_transmit, uint, 0644);
4279MODULE_PARM_DESC(max_transmit, "Max transmit value (default = 3)");
4280
63fbd24e 4281MODULE_AUTHOR("Marcel Holtmann <marcel@holtmann.org>");
1da177e4
LT		 4282MODULE_DESCRIPTION("Bluetooth L2CAP ver " VERSION);
4283MODULE_VERSION(VERSION);
4284MODULE_LICENSE("GPL");
4285MODULE_ALIAS("bt-proto-0");
kernel source for telekom puls (alcatel/mediatek)